chrome/browser/about_flags.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/about_flags.h"
   6
   7 #include <iterator>
   8 #include <map>
   9 #include <set>
  10 #include <utility>
  11
  12 #include "base/command_line.h"
  13 #include "base/memory/singleton.h"
  14 #include "base/metrics/sparse_histogram.h"
  15 #include "base/stl_util.h"
  16 #include "base/strings/string_number_conversions.h"
  17 #include "base/strings/string_util.h"
  18 #include "base/strings/utf_string_conversions.h"
  19 #include "base/values.h"
  20 #include "cc/base/switches.h"
  21 #include "chrome/browser/flags_storage.h"
  22 #include "chrome/common/channel_info.h"
  23 #include "chrome/common/chrome_content_client.h"
  24 #include "chrome/common/chrome_switches.h"
  25 #include "chrome/grit/chromium_strings.h"
  26 #include "chrome/grit/generated_resources.h"
  27 #include "chrome/grit/google_chrome_strings.h"
  28 #include "components/autofill/core/common/autofill_switches.h"
  29 #include "components/cloud_devices/common/cloud_devices_switches.h"
  30 #include "components/dom_distiller/core/dom_distiller_switches.h"
  31 #include "components/enhanced_bookmarks/enhanced_bookmark_switches.h"
  32 #include "components/metrics/metrics_hashes.h"
  33 #include "components/nacl/common/nacl_switches.h"
  34 #include "components/offline_pages/offline_page_switches.h"
  35 #include "components/omnibox/browser/omnibox_switches.h"
  36 #include "components/plugins/common/plugins_switches.h"
  37 #include "components/proximity_auth/switches.h"
  38 #include "components/search/search_switches.h"
  39 #include "components/version_info/version_info.h"
  40 #include "content/public/browser/user_metrics.h"
  41 #include "media/base/media_switches.h"
  42 #include "ui/base/l10n/l10n_util.h"
  43 #include "ui/base/ui_base_switches.h"
  44 #include "ui/display/display_switches.h"
  45 #include "ui/events/event_switches.h"
  46 #include "ui/gfx/switches.h"
  47 #include "ui/gl/gl_switches.h"
  48 #include "ui/keyboard/keyboard_switches.h"
  49 #include "ui/native_theme/native_theme_switches.h"
  50 #include "ui/views/views_switches.h"
  51
  52 #if defined(OS_ANDROID)
  53 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_switches.h"
  54 #else
  55 #include "ui/message_center/message_center_switches.h"
  56 #endif
  57
  58 #if defined(USE_ASH)
  59 #include "ash/ash_switches.h"
  60 #endif
  61
  62 #if defined(OS_CHROMEOS)
  63 #include "chromeos/chromeos_switches.h"
  64 #include "third_party/cros_system_api/switches/chrome_switches.h"
  65 #endif
  66
  67 #if defined(ENABLE_APP_LIST)
  68 #include "ui/app_list/app_list_switches.h"
  69 #endif
  70
  71 #if defined(ENABLE_EXTENSIONS)
  72 #include "extensions/common/switches.h"
  73 #endif
  74
  75 #if defined(USE_OZONE)
  76 #include "ui/ozone/public/ozone_switches.h"
  77 #endif
  78
  79 namespace about_flags {
  80
  81 // Macros to simplify specifying the type.
  82 #define SINGLE_VALUE_TYPE_AND_VALUE(command_line_switch, switch_value) \
  83     Experiment::SINGLE_VALUE, \
  84     command_line_switch, switch_value, NULL, NULL, NULL, 0
  85 #define SINGLE_VALUE_TYPE(command_line_switch) \
  86     SINGLE_VALUE_TYPE_AND_VALUE(command_line_switch, "")
  87 #define SINGLE_DISABLE_VALUE_TYPE_AND_VALUE(command_line_switch, switch_value) \
  88     Experiment::SINGLE_DISABLE_VALUE, \
  89     command_line_switch, switch_value, NULL, NULL, NULL, 0
  90 #define SINGLE_DISABLE_VALUE_TYPE(command_line_switch) \
  91     SINGLE_DISABLE_VALUE_TYPE_AND_VALUE(command_line_switch, "")
  92 #define ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(enable_switch, enable_value, \
  93                                             disable_switch, disable_value) \
  94     Experiment::ENABLE_DISABLE_VALUE, enable_switch, enable_value, \
  95     disable_switch, disable_value, NULL, 3
  96 #define ENABLE_DISABLE_VALUE_TYPE(enable_switch, disable_switch) \
  97     ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(enable_switch, "", disable_switch, "")
  98 #define MULTI_VALUE_TYPE(choices) \
  99     Experiment::MULTI_VALUE, NULL, NULL, NULL, NULL, choices, arraysize(choices)
 100
 101 namespace {
 102
 103 // Enumeration of OSs.
 104 enum {
 105   kOsMac = 1 << 0,
 106   kOsWin = 1 << 1,
 107   kOsLinux = 1 << 2,
 108   kOsCrOS = 1 << 3,
 109   kOsAndroid = 1 << 4,
 110   kOsCrOSOwnerOnly = 1 << 5
 111 };
 112
 113 const unsigned kOsAll = kOsMac | kOsWin | kOsLinux | kOsCrOS | kOsAndroid;
 114 const unsigned kOsDesktop = kOsMac | kOsWin | kOsLinux | kOsCrOS;
 115
 116 // Adds a |StringValue| to |list| for each platform where |bitmask| indicates
 117 // whether the experiment is available on that platform.
 118 void AddOsStrings(unsigned bitmask, base::ListValue* list) {
 119   struct {
 120     unsigned bit;
 121     const char* const name;
 122   } kBitsToOs[] = {
 123     {kOsMac, "Mac"},
 124     {kOsWin, "Windows"},
 125     {kOsLinux, "Linux"},
 126     {kOsCrOS, "Chrome OS"},
 127     {kOsAndroid, "Android"},
 128     {kOsCrOSOwnerOnly, "Chrome OS (owner only)"},
 129   };
 130   for (size_t i = 0; i < arraysize(kBitsToOs); ++i) {
 131     if (bitmask & kBitsToOs[i].bit)
 132       list->Append(new base::StringValue(kBitsToOs[i].name));
 133   }
 134 }
 135
 136 // Convert switch constants to proper CommandLine::StringType strings.
 137 base::CommandLine::StringType GetSwitchString(const std::string& flag) {
 138   base::CommandLine cmd_line(base::CommandLine::NO_PROGRAM);
 139   cmd_line.AppendSwitch(flag);
 140   DCHECK_EQ(2U, cmd_line.argv().size());
 141   return cmd_line.argv()[1];
 142 }
 143
 144 // Scoops flags from a command line.
 145 std::set<base::CommandLine::StringType> ExtractFlagsFromCommandLine(
 146     const base::CommandLine& cmdline) {
 147   std::set<base::CommandLine::StringType> flags;
 148   // First do the ones between --flag-switches-begin and --flag-switches-end.
 149   base::CommandLine::StringVector::const_iterator first =
 150       std::find(cmdline.argv().begin(), cmdline.argv().end(),
 151                 GetSwitchString(switches::kFlagSwitchesBegin));
 152   base::CommandLine::StringVector::const_iterator last =
 153       std::find(cmdline.argv().begin(), cmdline.argv().end(),
 154                 GetSwitchString(switches::kFlagSwitchesEnd));
 155   if (first != cmdline.argv().end() && last != cmdline.argv().end())
 156     flags.insert(first + 1, last);
 157 #if defined(OS_CHROMEOS)
 158   // Then add those between --policy-switches-begin and --policy-switches-end.
 159   first = std::find(cmdline.argv().begin(), cmdline.argv().end(),
 160                     GetSwitchString(chromeos::switches::kPolicySwitchesBegin));
 161   last = std::find(cmdline.argv().begin(), cmdline.argv().end(),
 162                    GetSwitchString(chromeos::switches::kPolicySwitchesEnd));
 163   if (first != cmdline.argv().end() && last != cmdline.argv().end())
 164     flags.insert(first + 1, last);
 165 #endif
 166   return flags;
 167 }
 168
 169 const Experiment::Choice kTouchEventsChoices[] = {
 170   { IDS_GENERIC_EXPERIMENT_CHOICE_AUTOMATIC, "", "" },
 171   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 172     switches::kTouchEvents,
 173     switches::kTouchEventsEnabled },
 174   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 175     switches::kTouchEvents,
 176     switches::kTouchEventsDisabled }
 177 };
 178
 179 #if defined(USE_AURA)
 180 const Experiment::Choice kOverscrollHistoryNavigationChoices[] = {
 181   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED, "", "" },
 182   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 183     switches::kOverscrollHistoryNavigation,
 184     "0" },
 185   { IDS_OVERSCROLL_HISTORY_NAVIGATION_SIMPLE_UI,
 186     switches::kOverscrollHistoryNavigation,
 187     "2" }
 188 };
 189 #endif
 190
 191 const Experiment::Choice kTouchTextSelectionStrategyChoices[] = {
 192   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 193   { IDS_TOUCH_SELECTION_STRATEGY_CHARACTER,
 194     switches::kTouchTextSelectionStrategy,
 195     "character" },
 196   { IDS_TOUCH_SELECTION_STRATEGY_DIRECTION,
 197     switches::kTouchTextSelectionStrategy,
 198     "direction" }
 199 };
 200
 201 #if !defined(DISABLE_NACL)
 202 const Experiment::Choice kNaClDebugMaskChoices[] = {
 203   // Secure shell can be used on ChromeOS for forwarding the TCP port opened by
 204   // debug stub to a remote machine. Since secure shell uses NaCl, we usually
 205   // want to avoid debugging that. The PNaCl translator is also a NaCl module,
 206   // so by default we want to avoid debugging that.
 207   // NOTE: As the default value must be the empty string, the mask excluding
 208   // the PNaCl translator and secure shell is substituted elsewhere.
 209   { IDS_NACL_DEBUG_MASK_CHOICE_EXCLUDE_UTILS_PNACL, "", "" },
 210   { IDS_NACL_DEBUG_MASK_CHOICE_DEBUG_ALL, switches::kNaClDebugMask, "*://*" },
 211   { IDS_NACL_DEBUG_MASK_CHOICE_INCLUDE_DEBUG,
 212       switches::kNaClDebugMask, "*://*/*debug.nmf" }
 213 };
 214 #endif
 215
 216 const Experiment::Choice kMarkNonSecureAsChoices[] = {
 217     { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 218     { IDS_MARK_NON_SECURE_AS_NEUTRAL,
 219         switches::kMarkNonSecureAs, switches::kMarkNonSecureAsNeutral},
 220     { IDS_MARK_NON_SECURE_AS_NON_SECURE,
 221         switches::kMarkNonSecureAs, switches::kMarkNonSecureAsNonSecure}
 222 };
 223
 224 const Experiment::Choice kDataReductionProxyLoFiChoices[] = {
 225     { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 226     { IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_ALWAYS_ON,
 227         data_reduction_proxy::switches::kDataReductionProxyLoFi,
 228         data_reduction_proxy::switches::kDataReductionProxyLoFiValueAlwaysOn},
 229     { IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_CELLULAR_ONLY,
 230         data_reduction_proxy::switches::kDataReductionProxyLoFi,
 231         data_reduction_proxy::switches::
 232             kDataReductionProxyLoFiValueCellularOnly},
 233     { IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_DISABLED,
 234         data_reduction_proxy::switches::kDataReductionProxyLoFi,
 235         data_reduction_proxy::switches::kDataReductionProxyLoFiValueDisabled},
 236     { IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_SLOW_CONNECTIONS_ONLY,
 237         data_reduction_proxy::switches::kDataReductionProxyLoFi,
 238         data_reduction_proxy::switches::
 239             kDataReductionProxyLoFiValueSlowConnectionsOnly}
 240 };
 241
 242 const Experiment::Choice kShowSavedCopyChoices[] = {
 243   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 244   { IDS_FLAGS_ENABLE_SHOW_SAVED_COPY_PRIMARY,
 245     switches::kShowSavedCopy, switches::kEnableShowSavedCopyPrimary },
 246   { IDS_FLAGS_ENABLE_SHOW_SAVED_COPY_SECONDARY,
 247     switches::kShowSavedCopy, switches::kEnableShowSavedCopySecondary },
 248   { IDS_FLAGS_DISABLE_SHOW_SAVED_COPY,
 249     switches::kShowSavedCopy, switches::kDisableShowSavedCopy }
 250 };
 251
 252 const Experiment::Choice kDefaultTileWidthChoices[] = {
 253   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 254   { IDS_FLAGS_DEFAULT_TILE_WIDTH_SHORT,
 255     switches::kDefaultTileWidth, "128"},
 256   { IDS_FLAGS_DEFAULT_TILE_WIDTH_TALL,
 257     switches::kDefaultTileWidth, "256"},
 258   { IDS_FLAGS_DEFAULT_TILE_WIDTH_GRANDE,
 259     switches::kDefaultTileWidth, "512"},
 260   { IDS_FLAGS_DEFAULT_TILE_WIDTH_VENTI,
 261     switches::kDefaultTileWidth, "1024"}
 262 };
 263
 264 const Experiment::Choice kDefaultTileHeightChoices[] = {
 265   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 266   { IDS_FLAGS_DEFAULT_TILE_HEIGHT_SHORT,
 267     switches::kDefaultTileHeight, "128"},
 268   { IDS_FLAGS_DEFAULT_TILE_HEIGHT_TALL,
 269     switches::kDefaultTileHeight, "256"},
 270   { IDS_FLAGS_DEFAULT_TILE_HEIGHT_GRANDE,
 271     switches::kDefaultTileHeight, "512"},
 272   { IDS_FLAGS_DEFAULT_TILE_HEIGHT_VENTI,
 273     switches::kDefaultTileHeight, "1024"}
 274 };
 275
 276 const Experiment::Choice kSimpleCacheBackendChoices[] = {
 277   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 278   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 279     switches::kUseSimpleCacheBackend, "off" },
 280   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 281     switches::kUseSimpleCacheBackend, "on"}
 282 };
 283
 284 #if defined(USE_AURA)
 285 const Experiment::Choice kTabCaptureUpscaleQualityChoices[] = {
 286   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 287   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_FAST,
 288     switches::kTabCaptureUpscaleQuality, "fast" },
 289   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_GOOD,
 290     switches::kTabCaptureUpscaleQuality, "good" },
 291   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_BEST,
 292     switches::kTabCaptureUpscaleQuality, "best" },
 293 };
 294
 295 const Experiment::Choice kTabCaptureDownscaleQualityChoices[] = {
 296   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 297   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_FAST,
 298     switches::kTabCaptureDownscaleQuality, "fast" },
 299   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_GOOD,
 300     switches::kTabCaptureDownscaleQuality, "good" },
 301   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_BEST,
 302     switches::kTabCaptureDownscaleQuality, "best" },
 303 };
 304 #endif
 305
 306 #if defined(OS_ANDROID)
 307 const Experiment::Choice kZeroSuggestExperimentsChoices[] = {
 308   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 309   { IDS_FLAGS_ZERO_SUGGEST_MOST_VISITED,
 310     switches::kEnableZeroSuggestMostVisited, ""},
 311   { IDS_FLAGS_ZERO_SUGGEST_MOST_VISITED_WITHOUT_SERP,
 312     switches::kEnableZeroSuggestMostVisitedWithoutSerp, ""},
 313   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 314     switches::kDisableZeroSuggest, ""}
 315 };
 316
 317 const Experiment::Choice kReaderModeHeuristicsChoices[] = {
 318     { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
 319     { IDS_FLAGS_READER_MODE_HEURISTICS_MARKUP,
 320       switches::kReaderModeHeuristics,
 321       switches::reader_mode_heuristics::kOGArticle },
 322     { IDS_FLAGS_READER_MODE_HEURISTICS_ADABOOST,
 323       switches::kReaderModeHeuristics,
 324       switches::reader_mode_heuristics::kAdaBoost },
 325     { IDS_FLAGS_READER_MODE_HEURISTICS_ALWAYS_ON,
 326       switches::kReaderModeHeuristics,
 327       switches::reader_mode_heuristics::kAlwaysTrue },
 328     { IDS_FLAGS_READER_MODE_HEURISTICS_ALWAYS_OFF,
 329       switches::kReaderModeHeuristics,
 330       switches::reader_mode_heuristics::kNone },
 331 };
 332 #endif
 333
 334 const Experiment::Choice kNumRasterThreadsChoices[] = {
 335   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 336   { IDS_FLAGS_NUM_RASTER_THREADS_ONE, switches::kNumRasterThreads, "1" },
 337   { IDS_FLAGS_NUM_RASTER_THREADS_TWO, switches::kNumRasterThreads, "2" },
 338   { IDS_FLAGS_NUM_RASTER_THREADS_THREE, switches::kNumRasterThreads, "3" },
 339   { IDS_FLAGS_NUM_RASTER_THREADS_FOUR, switches::kNumRasterThreads, "4" }
 340 };
 341
 342 const Experiment::Choice kGpuRasterizationMSAASampleCountChoices[] = {
 343   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT,
 344     "",
 345     "" },
 346   { IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_ZERO,
 347     switches::kGpuRasterizationMSAASampleCount, "0" },
 348   { IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_TWO,
 349     switches::kGpuRasterizationMSAASampleCount, "2" },
 350   { IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_FOUR,
 351     switches::kGpuRasterizationMSAASampleCount, "4" },
 352   { IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_EIGHT,
 353     switches::kGpuRasterizationMSAASampleCount, "8" },
 354   { IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_SIXTEEN,
 355     switches::kGpuRasterizationMSAASampleCount, "16" },
 356 };
 357
 358 const Experiment::Choice kEnableGpuRasterizationChoices[] = {
 359   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 360   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 361     switches::kEnableGpuRasterization, "" },
 362   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 363     switches::kDisableGpuRasterization, "" },
 364   { IDS_FLAGS_FORCE_GPU_RASTERIZATION,
 365     switches::kForceGpuRasterization, "" },
 366 };
 367
 368 #if defined(OS_CHROMEOS)
 369 const Experiment::Choice kMemoryPressureThresholdChoices[] = {
 370     { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 371     { IDS_FLAGS_CONSERVATIVE_THRESHOLDS,
 372       chromeos::switches::kMemoryPressureThresholds,
 373       chromeos::switches::kConservativeThreshold },
 374     { IDS_FLAGS_AGGRESSIVE_CACHE_DISCARD_THRESHOLDS,
 375       chromeos::switches::kMemoryPressureThresholds,
 376       chromeos::switches::kAggressiveCacheDiscardThreshold },
 377     { IDS_FLAGS_AGGRESSIVE_TAB_DISCARD_THRESHOLDS,
 378       chromeos::switches::kMemoryPressureThresholds,
 379       chromeos::switches::kAggressiveTabDiscardThreshold },
 380     { IDS_FLAGS_AGGRESSIVE_THRESHOLDS,
 381       chromeos::switches::kMemoryPressureThresholds,
 382       chromeos::switches::kAggressiveThreshold },
 383 };
 384 #endif
 385
 386 const Experiment::Choice kExtensionContentVerificationChoices[] = {
 387   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 388   { IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_BOOTSTRAP,
 389     switches::kExtensionContentVerification,
 390     switches::kExtensionContentVerificationBootstrap },
 391   { IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_ENFORCE,
 392     switches::kExtensionContentVerification,
 393     switches::kExtensionContentVerificationEnforce },
 394   { IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_ENFORCE_STRICT,
 395     switches::kExtensionContentVerification,
 396     switches::kExtensionContentVerificationEnforceStrict },
 397 };
 398
 399 const Experiment::Choice kAutofillSyncCredentialChoices[] = {
 400   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
 401   { IDS_ALLOW_AUTOFILL_SYNC_CREDENTIAL,
 402     password_manager::switches::kAllowAutofillSyncCredential, ""},
 403   { IDS_DISALLOW_AUTOFILL_SYNC_CREDENTIAL_FOR_REAUTH,
 404     password_manager::switches::kDisallowAutofillSyncCredentialForReauth, ""},
 405   { IDS_DISALLOW_AUTOFILL_SYNC_CREDENTIAL,
 406     password_manager::switches::kDisallowAutofillSyncCredential, ""},
 407 };
 408
 409 const Experiment::Choice kFillOnAccountSelectChoices[] = {
 410   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 411   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 412     autofill::switches::kDisableFillOnAccountSelect, "" },
 413   { IDS_FLAGS_FILL_ON_ACCOUNT_SELECT_ENABLE_HIGHLIGHTING,
 414     autofill::switches::kEnableFillOnAccountSelect, "" },
 415   { IDS_FLAGS_FILL_ON_ACCOUNT_SELECT_ENABLE_NO_HIGHLIGHTING,
 416     autofill::switches::kEnableFillOnAccountSelectNoHighlighting, "" },
 417 };
 418
 419 #if defined(USE_ASH)
 420 const Experiment::Choice kAshScreenRotationAnimationChoices[] = {
 421   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 422   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 423     ash::switches::kAshEnableScreenRotationAnimation,
 424     "none" },
 425   { IDS_ASH_SCREEN_ROTATION_ANIMATION_PARTIAL_ROTATION,
 426     ash::switches::kAshEnableScreenRotationAnimation,
 427     "partial-rotation" },
 428   { IDS_ASH_SCREEN_ROTATION_ANIMATION_FULL_ROTATION,
 429     ash::switches::kAshEnableScreenRotationAnimation,
 430     "full-rotation" }
 431 };
 432 #endif
 433
 434 #if defined(ENABLE_TOPCHROME_MD)
 435 const Experiment::Choice kTopChromeMaterialDesignChoices[] = {
 436     {IDS_FLAGS_TOP_CHROME_MD_NON_MATERIAL, "", ""},
 437     {IDS_FLAGS_TOP_CHROME_MD_MATERIAL,
 438      switches::kTopChromeMD,
 439      switches::kTopChromeMDMaterial},
 440     {IDS_FLAGS_TOP_CHROME_MD_MATERIAL_HYBRID,
 441      switches::kTopChromeMD,
 442      switches::kTopChromeMDMaterialHybrid}};
 443 #endif
 444
 445 #if defined(OS_CHROMEOS)
 446 const Experiment::Choice kAshMaterialDesignInkDrop[] = {
 447     {IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
 448     {IDS_FLAGS_MATERIAL_DESIGN_INK_DROP_CIRCLE,
 449      switches::kMaterialDesignInkDrop,
 450      switches::kMaterialDesignInkDropCircle},
 451     {IDS_FLAGS_MATERIAL_DESIGN_INK_DROP_SQUARE,
 452      switches::kMaterialDesignInkDrop,
 453      switches::kMaterialDesignInkDropSquare}};
 454
 455 const Experiment::Choice kAshMaterialDesignInkDropAnimationSpeed[] = {
 456     {IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
 457     {IDS_FLAGS_MATERIAL_DESIGN_INK_DROP_ANIMATION_FAST,
 458      switches::kMaterialDesignInkDropAnimationSpeed,
 459      switches::kMaterialDesignInkDropAnimationSpeedFast},
 460     {IDS_FLAGS_MATERIAL_DESIGN_INK_DROP_ANIMATION_SLOW,
 461      switches::kMaterialDesignInkDropAnimationSpeed,
 462      switches::kMaterialDesignInkDropAnimationSpeedSlow}};
 463
 464 const Experiment::Choice kDataSaverPromptChoices[] = {
 465   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 466   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 467     chromeos::switches::kEnableDataSaverPrompt, "" },
 468   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 469     chromeos::switches::kDisableDataSaverPrompt, "" },
 470   { IDS_FLAGS_DATASAVER_PROMPT_DEMO_MODE,
 471     chromeos::switches::kEnableDataSaverPrompt,
 472     chromeos::switches::kDataSaverPromptDemoMode },
 473 };
 474
 475 const Experiment::Choice kFloatingVirtualKeyboardChoices[] = {
 476   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 477   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 478     keyboard::switches::kFloatingVirtualKeyboard,
 479     keyboard::switches::kFloatingVirtualKeyboardDisabled},
 480   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 481     keyboard::switches::kFloatingVirtualKeyboard,
 482     keyboard::switches::kFloatingVirtualKeyboardEnabled},
 483 };
 484
 485 const Experiment::Choice kSmartVirtualKeyboardChoices[] = {
 486   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 487   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 488     keyboard::switches::kSmartVirtualKeyboard,
 489     keyboard::switches::kSmartVirtualKeyboardDisabled},
 490   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 491     keyboard::switches::kSmartVirtualKeyboard,
 492     keyboard::switches::kSmartVirtualKeyboardEnabled},
 493 };
 494
 495 const Experiment::Choice kGestureTypingChoices[] = {
 496   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 497   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 498     keyboard::switches::kGestureTyping,
 499     keyboard::switches::kGestureTypingDisabled},
 500   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 501     keyboard::switches::kGestureTyping,
 502     keyboard::switches::kGestureTypingEnabled},
 503 };
 504
 505 const Experiment::Choice kGestureEditingChoices[] = {
 506   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 507   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 508     keyboard::switches::kGestureEditing,
 509     keyboard::switches::kGestureEditingDisabled},
 510   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 511     keyboard::switches::kGestureEditing,
 512     keyboard::switches::kGestureEditingEnabled},
 513 };
 514 #endif
 515
 516 const Experiment::Choice kDownloadNotificationChoices[] = {
 517   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 518   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 519     switches::kEnableDownloadNotification,
 520     "enabled" },
 521   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 522     switches::kEnableDownloadNotification,
 523     "disabled" }
 524 };
 525
 526 const Experiment::Choice kSupervisedUserSafeSitesChoices[] = {
 527   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 528   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 529     switches::kSupervisedUserSafeSites,
 530     "enabled" },
 531   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 532     switches::kSupervisedUserSafeSites,
 533     "disabled" },
 534   { IDS_SUPERVISED_USER_SAFESITES_BLACKLIST_ONLY,
 535     switches::kSupervisedUserSafeSites,
 536     "blacklist-only" },
 537   { IDS_SUPERVISED_USER_SAFESITES_ONLINE_CHECK_ONLY,
 538     switches::kSupervisedUserSafeSites,
 539     "online-check-only" }
 540 };
 541
 542 const Experiment::Choice kV8CacheOptionsChoices[] = {
 543   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 544   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED, switches::kV8CacheOptions, "none" },
 545   { IDS_FLAGS_V8_CACHE_OPTIONS_PARSE, switches::kV8CacheOptions, "parse" },
 546   { IDS_FLAGS_V8_CACHE_OPTIONS_CODE, switches::kV8CacheOptions, "code" },
 547 };
 548
 549 #if defined(OS_ANDROID)
 550 const Experiment::Choice kProgressBarAnimationChoices[] = {
 551   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 552   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 553       switches::kProgressBarAnimation, "disabled" },
 554   { IDS_FLAGS_PROGRESS_BAR_ANIMATION_LINEAR,
 555         switches::kProgressBarAnimation, "linear" },
 556   { IDS_FLAGS_PROGRESS_BAR_ANIMATION_SMOOTH,
 557       switches::kProgressBarAnimation, "smooth" },
 558   { IDS_FLAGS_PROGRESS_BAR_ANIMATION_FAST_START,
 559       switches::kProgressBarAnimation, "fast-start" },
 560 };
 561 #endif  // defined(OS_ANDROID)
 562
 563 // RECORDING USER METRICS FOR FLAGS:
 564 // -----------------------------------------------------------------------------
 565 // The first line of the experiment is the internal name. If you'd like to
 566 // gather statistics about the usage of your flag, you should append a marker
 567 // comment to the end of the feature name, like so:
 568 //   "my-special-feature",  // FLAGS:RECORD_UMA
 569 //
 570 // After doing that, run
 571 //   tools/metrics/actions/extract_actions.py
 572 // to add the metric to actions.xml (which will enable UMA to record your
 573 // feature flag), then update the <owner>s and <description> sections. Make sure
 574 // to include the actions.xml file when you upload your code for review!
 575 //
 576 // After your feature has shipped under a flag, you can locate the metrics under
 577 // the action name AboutFlags_internal-action-name. Actions are recorded once
 578 // per startup, so you should divide this number by AboutFlags_StartupTick to
 579 // get a sense of usage. Note that this will not be the same as number of users
 580 // with a given feature enabled because users can quit and relaunch the
 581 // application multiple times over a given time interval. The dashboard also
 582 // shows you how many (metrics reporting) users have enabled the flag over the
 583 // last seven days. However, note that this is not the same as the number of
 584 // users who have the flag enabled, since enabling the flag happens once,
 585 // whereas running with the flag enabled happens until the user flips the flag
 586 // again.
 587
 588 // To add a new experiment add to the end of kExperiments. There are two
 589 // distinct types of experiments:
 590 // . SINGLE_VALUE: experiment is either on or off. Use the SINGLE_VALUE_TYPE
 591 //   macro for this type supplying the command line to the macro.
 592 // . MULTI_VALUE: a list of choices, the first of which should correspond to a
 593 //   deactivated state for this lab (i.e. no command line option).  To specify
 594 //   this type of experiment use the macro MULTI_VALUE_TYPE supplying it the
 595 //   array of choices.
 596 // See the documentation of Experiment for details on the fields.
 597 //
 598 // Command-line switches must have entries in enum "LoginCustomFlags" in
 599 // histograms.xml. See note in histograms.xml and don't forget to run
 600 // AboutFlagsHistogramTest unit test to calculate and verify checksum.
 601 //
 602 // When adding a new choice, add it to the end of the list.
 603 const Experiment kExperiments[] = {
 604     {"ignore-gpu-blacklist",
 605      IDS_FLAGS_IGNORE_GPU_BLACKLIST_NAME,
 606      IDS_FLAGS_IGNORE_GPU_BLACKLIST_DESCRIPTION,
 607      kOsAll,
 608      SINGLE_VALUE_TYPE(switches::kIgnoreGpuBlacklist)},
 609 #if defined(OS_WIN)
 610     {"disable-direct-write",
 611      IDS_FLAGS_DISABLE_DIRECT_WRITE_NAME,
 612      IDS_FLAGS_DISABLE_DIRECT_WRITE_DESCRIPTION,
 613      kOsWin,
 614      SINGLE_VALUE_TYPE(switches::kDisableDirectWrite)},
 615 #endif
 616     {"enable-experimental-canvas-features",
 617      IDS_FLAGS_ENABLE_EXPERIMENTAL_CANVAS_FEATURES_NAME,
 618      IDS_FLAGS_ENABLE_EXPERIMENTAL_CANVAS_FEATURES_DESCRIPTION,
 619      kOsAll,
 620      SINGLE_VALUE_TYPE(switches::kEnableExperimentalCanvasFeatures)},
 621     {"disable-accelerated-2d-canvas",
 622      IDS_FLAGS_DISABLE_ACCELERATED_2D_CANVAS_NAME,
 623      IDS_FLAGS_DISABLE_ACCELERATED_2D_CANVAS_DESCRIPTION,
 624      kOsAll,
 625      SINGLE_VALUE_TYPE(switches::kDisableAccelerated2dCanvas)},
 626     {"enable-display-list-2d-canvas",
 627      IDS_FLAGS_ENABLE_DISPLAY_LIST_2D_CANVAS_NAME,
 628      IDS_FLAGS_ENABLE_DISPLAY_LIST_2D_CANVAS_DESCRIPTION,
 629      kOsAll,
 630      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableDisplayList2dCanvas,
 631                                switches::kDisableDisplayList2dCanvas)},
 632     {"composited-layer-borders",
 633      IDS_FLAGS_COMPOSITED_LAYER_BORDERS,
 634      IDS_FLAGS_COMPOSITED_LAYER_BORDERS_DESCRIPTION,
 635      kOsAll,
 636      SINGLE_VALUE_TYPE(cc::switches::kShowCompositedLayerBorders)},
 637     {"show-fps-counter",
 638      IDS_FLAGS_SHOW_FPS_COUNTER,
 639      IDS_FLAGS_SHOW_FPS_COUNTER_DESCRIPTION,
 640      kOsAll,
 641      SINGLE_VALUE_TYPE(cc::switches::kShowFPSCounter)},
 642     {"disable-webgl",
 643      IDS_FLAGS_DISABLE_WEBGL_NAME,
 644      IDS_FLAGS_DISABLE_WEBGL_DESCRIPTION,
 645      kOsAll,
 646      SINGLE_VALUE_TYPE(switches::kDisableExperimentalWebGL)},
 647 #if defined(ENABLE_WEBRTC)
 648     {"disable-webrtc-hw-decoding",
 649      IDS_FLAGS_DISABLE_WEBRTC_HW_DECODING_NAME,
 650      IDS_FLAGS_DISABLE_WEBRTC_HW_DECODING_DESCRIPTION,
 651      kOsAndroid | kOsCrOS,
 652      SINGLE_VALUE_TYPE(switches::kDisableWebRtcHWDecoding)},
 653     {"disable-webrtc-hw-encoding",
 654      IDS_FLAGS_DISABLE_WEBRTC_HW_ENCODING_NAME,
 655      IDS_FLAGS_DISABLE_WEBRTC_HW_ENCODING_DESCRIPTION,
 656      kOsAndroid | kOsCrOS,
 657      SINGLE_VALUE_TYPE(switches::kDisableWebRtcHWEncoding)},
 658     {"enable-webrtc-stun-origin",
 659      IDS_FLAGS_ENABLE_WEBRTC_STUN_ORIGIN_NAME,
 660      IDS_FLAGS_ENABLE_WEBRTC_STUN_ORIGIN_DESCRIPTION,
 661      kOsAll,
 662      SINGLE_VALUE_TYPE(switches::kEnableWebRtcStunOrigin)},
 663 #endif
 664 #if defined(OS_ANDROID)
 665     {"disable-webaudio",
 666      IDS_FLAGS_DISABLE_WEBAUDIO_NAME,
 667      IDS_FLAGS_DISABLE_WEBAUDIO_DESCRIPTION,
 668      kOsAndroid,
 669      SINGLE_VALUE_TYPE(switches::kDisableWebAudio)},
 670 #endif
 671   // Native client is compiled out when DISABLE_NACL is defined.
 672 #if !defined(DISABLE_NACL)
 673     {"enable-nacl",  // FLAGS:RECORD_UMA
 674      IDS_FLAGS_ENABLE_NACL_NAME,
 675      IDS_FLAGS_ENABLE_NACL_DESCRIPTION,
 676      kOsAll,
 677      SINGLE_VALUE_TYPE(switches::kEnableNaCl)},
 678     {"enable-nacl-debug",  // FLAGS:RECORD_UMA
 679      IDS_FLAGS_ENABLE_NACL_DEBUG_NAME,
 680      IDS_FLAGS_ENABLE_NACL_DEBUG_DESCRIPTION,
 681      kOsDesktop,
 682      SINGLE_VALUE_TYPE(switches::kEnableNaClDebug)},
 683     {"nacl-debug-mask",  // FLAGS:RECORD_UMA
 684      IDS_FLAGS_NACL_DEBUG_MASK_NAME,
 685      IDS_FLAGS_NACL_DEBUG_MASK_DESCRIPTION,
 686      kOsDesktop,
 687      MULTI_VALUE_TYPE(kNaClDebugMaskChoices)},
 688 #endif
 689 #if defined(ENABLE_EXTENSIONS)
 690     {"extension-apis",  // FLAGS:RECORD_UMA
 691      IDS_FLAGS_EXPERIMENTAL_EXTENSION_APIS_NAME,
 692      IDS_FLAGS_EXPERIMENTAL_EXTENSION_APIS_DESCRIPTION,
 693      kOsDesktop,
 694      SINGLE_VALUE_TYPE(extensions::switches::kEnableExperimentalExtensionApis)},
 695     {"extensions-on-chrome-urls",
 696      IDS_FLAGS_EXTENSIONS_ON_CHROME_URLS_NAME,
 697      IDS_FLAGS_EXTENSIONS_ON_CHROME_URLS_DESCRIPTION,
 698      kOsAll,
 699      SINGLE_VALUE_TYPE(extensions::switches::kExtensionsOnChromeURLs)},
 700 #endif
 701     {"enable-fast-unload",
 702      IDS_FLAGS_ENABLE_FAST_UNLOAD_NAME,
 703      IDS_FLAGS_ENABLE_FAST_UNLOAD_DESCRIPTION,
 704      kOsAll,
 705      SINGLE_VALUE_TYPE(switches::kEnableFastUnload)},
 706 #if defined(ENABLE_EXTENSIONS)
 707     {"enable-app-window-controls",
 708      IDS_FLAGS_ENABLE_APP_WINDOW_CONTROLS_NAME,
 709      IDS_FLAGS_ENABLE_APP_WINDOW_CONTROLS_DESCRIPTION,
 710      kOsDesktop,
 711      SINGLE_VALUE_TYPE(extensions::switches::kEnableAppWindowControls)},
 712 #endif
 713     {"disable-hyperlink-auditing",
 714      IDS_FLAGS_DISABLE_HYPERLINK_AUDITING_NAME,
 715      IDS_FLAGS_DISABLE_HYPERLINK_AUDITING_DESCRIPTION,
 716      kOsAll,
 717      SINGLE_VALUE_TYPE(switches::kNoPings)},
 718 #if defined(OS_ANDROID)
 719     {"contextual-search",
 720      IDS_FLAGS_ENABLE_CONTEXTUAL_SEARCH,
 721      IDS_FLAGS_ENABLE_CONTEXTUAL_SEARCH_DESCRIPTION,
 722      kOsAndroid,
 723      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableContextualSearch,
 724                                switches::kDisableContextualSearch)},
 725 #endif
 726     {"show-autofill-type-predictions",
 727      IDS_FLAGS_SHOW_AUTOFILL_TYPE_PREDICTIONS_NAME,
 728      IDS_FLAGS_SHOW_AUTOFILL_TYPE_PREDICTIONS_DESCRIPTION,
 729      kOsAll,
 730      SINGLE_VALUE_TYPE(autofill::switches::kShowAutofillTypePredictions)},
 731     {"enable-smooth-scrolling",  // FLAGS:RECORD_UMA
 732      IDS_FLAGS_ENABLE_SMOOTH_SCROLLING_NAME,
 733      IDS_FLAGS_ENABLE_SMOOTH_SCROLLING_DESCRIPTION,
 734      // Can't expose the switch unless the code is compiled in.
 735      // On by default for the Mac (different implementation in WebKit).
 736      kOsLinux | kOsWin,
 737      SINGLE_VALUE_TYPE(switches::kEnableSmoothScrolling)},
 738 #if defined(USE_AURA) || defined(OS_LINUX)
 739     {"overlay-scrollbars",
 740      IDS_FLAGS_ENABLE_OVERLAY_SCROLLBARS_NAME,
 741      IDS_FLAGS_ENABLE_OVERLAY_SCROLLBARS_DESCRIPTION,
 742      // Uses the system preference on Mac (a different implementation).
 743      // On Android, this is always enabled.
 744      kOsLinux | kOsCrOS | kOsWin,
 745      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableOverlayScrollbar,
 746                                switches::kDisableOverlayScrollbar)},
 747 #endif
 748     {"enable-panels",
 749      IDS_FLAGS_ENABLE_PANELS_NAME,
 750      IDS_FLAGS_ENABLE_PANELS_DESCRIPTION,
 751      kOsDesktop,
 752      SINGLE_VALUE_TYPE(switches::kEnablePanels)},
 753     {// See http://crbug.com/120416 for how to remove this flag.
 754      "save-page-as-mhtml",  // FLAGS:RECORD_UMA
 755      IDS_FLAGS_SAVE_PAGE_AS_MHTML_NAME,
 756      IDS_FLAGS_SAVE_PAGE_AS_MHTML_DESCRIPTION,
 757      kOsMac | kOsWin | kOsLinux,
 758      SINGLE_VALUE_TYPE(switches::kSavePageAsMHTML)},
 759     {"enable-quic",
 760      IDS_FLAGS_ENABLE_QUIC_NAME,
 761      IDS_FLAGS_ENABLE_QUIC_DESCRIPTION,
 762      kOsAll,
 763      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableQuic, switches::kDisableQuic)},
 764     {"disable-media-source",
 765      IDS_FLAGS_DISABLE_MEDIA_SOURCE_NAME,
 766      IDS_FLAGS_DISABLE_MEDIA_SOURCE_DESCRIPTION,
 767      kOsAll,
 768      SINGLE_VALUE_TYPE(switches::kDisableMediaSource)},
 769     {"disable-encrypted-media",
 770      IDS_FLAGS_DISABLE_ENCRYPTED_MEDIA_NAME,
 771      IDS_FLAGS_DISABLE_ENCRYPTED_MEDIA_DESCRIPTION,
 772      kOsAll,
 773      SINGLE_VALUE_TYPE(switches::kDisableEncryptedMedia)},
 774     {"disable-prefixed-encrypted-media",
 775      IDS_FLAGS_DISABLE_PREFIXED_ENCRYPTED_MEDIA_NAME,
 776      IDS_FLAGS_DISABLE_PREFIXED_ENCRYPTED_MEDIA_DESCRIPTION,
 777      kOsAll,
 778      SINGLE_VALUE_TYPE(switches::kDisablePrefixedEncryptedMedia)},
 779     {"disable-javascript-harmony-shipping",
 780      IDS_FLAGS_DISABLE_JAVASCRIPT_HARMONY_SHIPPING_NAME,
 781      IDS_FLAGS_DISABLE_JAVASCRIPT_HARMONY_SHIPPING_DESCRIPTION,
 782      kOsAll,
 783      SINGLE_VALUE_TYPE(switches::kDisableJavaScriptHarmonyShipping)},
 784     {"enable-javascript-harmony",
 785      IDS_FLAGS_ENABLE_JAVASCRIPT_HARMONY_NAME,
 786      IDS_FLAGS_ENABLE_JAVASCRIPT_HARMONY_DESCRIPTION,
 787      kOsAll,
 788      SINGLE_VALUE_TYPE(switches::kJavaScriptHarmony)},
 789     {"disable-software-rasterizer",
 790      IDS_FLAGS_DISABLE_SOFTWARE_RASTERIZER_NAME,
 791      IDS_FLAGS_DISABLE_SOFTWARE_RASTERIZER_DESCRIPTION,
 792 #if defined(ENABLE_SWIFTSHADER)
 793      kOsAll,
 794 #else
 795      0,
 796 #endif
 797      SINGLE_VALUE_TYPE(switches::kDisableSoftwareRasterizer)},
 798     {"enable-gpu-rasterization",
 799      IDS_FLAGS_ENABLE_GPU_RASTERIZATION_NAME,
 800      IDS_FLAGS_ENABLE_GPU_RASTERIZATION_DESCRIPTION,
 801      kOsAll,
 802      MULTI_VALUE_TYPE(kEnableGpuRasterizationChoices)},
 803     {"gpu-rasterization-msaa-sample-count",
 804      IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_NAME,
 805      IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_DESCRIPTION,
 806      kOsAll,
 807      MULTI_VALUE_TYPE(kGpuRasterizationMSAASampleCountChoices)},
 808     {"disable-slimming-paint",
 809      IDS_FLAGS_DISABLE_SLIMMING_PAINT_NAME,
 810      IDS_FLAGS_DISABLE_SLIMMING_PAINT_DESCRIPTION,
 811      kOsAll,
 812      SINGLE_VALUE_TYPE(switches::kDisableSlimmingPaint)},
 813     {"enable-slimming-paint",
 814      IDS_FLAGS_ENABLE_SLIMMING_PAINT_NAME,
 815      IDS_FLAGS_ENABLE_SLIMMING_PAINT_DESCRIPTION,
 816      kOsAll,
 817      SINGLE_VALUE_TYPE(switches::kEnableSlimmingPaint)},
 818      {"enable-slimming-paint-v2",
 819       IDS_FLAGS_ENABLE_SLIMMING_PAINT_V2_NAME,
 820       IDS_FLAGS_ENABLE_SLIMMING_PAINT_V2_DESCRIPTION,
 821       kOsAll,
 822       SINGLE_VALUE_TYPE(switches::kEnableSlimmingPaintV2)},
 823     {"enable-experimental-web-platform-features",
 824      IDS_FLAGS_EXPERIMENTAL_WEB_PLATFORM_FEATURES_NAME,
 825      IDS_FLAGS_EXPERIMENTAL_WEB_PLATFORM_FEATURES_DESCRIPTION,
 826      kOsAll,
 827      SINGLE_VALUE_TYPE(switches::kEnableExperimentalWebPlatformFeatures)},
 828     {"enable-web-bluetooth",
 829      IDS_FLAGS_WEB_BLUETOOTH_NAME,
 830      IDS_FLAGS_WEB_BLUETOOTH_DESCRIPTION,
 831      kOsAll,
 832      SINGLE_VALUE_TYPE(switches::kEnableWebBluetooth)},
 833     {"enable-devtools-experiments",
 834      IDS_FLAGS_ENABLE_DEVTOOLS_EXPERIMENTS_NAME,
 835      IDS_FLAGS_ENABLE_DEVTOOLS_EXPERIMENTS_DESCRIPTION,
 836      kOsDesktop,
 837      SINGLE_VALUE_TYPE(switches::kEnableDevToolsExperiments)},
 838     {"silent-debugger-extension-api",
 839      IDS_FLAGS_SILENT_DEBUGGER_EXTENSION_API_NAME,
 840      IDS_FLAGS_SILENT_DEBUGGER_EXTENSION_API_DESCRIPTION,
 841      kOsDesktop,
 842      SINGLE_VALUE_TYPE(switches::kSilentDebuggerExtensionAPI)},
 843 #if defined(ENABLE_SPELLCHECK)
 844 #if defined(OS_ANDROID)
 845     {"enable-android-spellchecker",
 846      IDS_OPTIONS_ENABLE_SPELLCHECK,
 847      IDS_OPTIONS_ENABLE_ANDROID_SPELLCHECKER_DESCRIPTION,
 848      kOsAndroid,
 849      SINGLE_VALUE_TYPE(switches::kEnableAndroidSpellChecker)},
 850 #endif
 851     {"spellcheck-autocorrect",
 852      IDS_FLAGS_SPELLCHECK_AUTOCORRECT,
 853      IDS_FLAGS_SPELLCHECK_AUTOCORRECT_DESCRIPTION,
 854      kOsWin | kOsLinux | kOsCrOS,
 855      SINGLE_VALUE_TYPE(switches::kEnableSpellingAutoCorrect)},
 856 #endif
 857 #if defined(ENABLE_SPELLCHECK) && \
 858     (defined(OS_LINUX) || defined(OS_WIN) || defined(OS_CHROMEOS))
 859     {"enable-multilingual-spellchecker",
 860      IDS_FLAGS_ENABLE_MULTILINGUAL_SPELLCHECKER_NAME,
 861      IDS_FLAGS_ENABLE_MULTILINGUAL_SPELLCHECKER_DESCRIPTION,
 862      kOsWin | kOsLinux | kOsCrOS,
 863      SINGLE_VALUE_TYPE(switches::kEnableMultilingualSpellChecker)},
 864 #endif
 865     {"enable-scroll-prediction",
 866      IDS_FLAGS_ENABLE_SCROLL_PREDICTION_NAME,
 867      IDS_FLAGS_ENABLE_SCROLL_PREDICTION_DESCRIPTION,
 868      kOsDesktop,
 869      SINGLE_VALUE_TYPE(switches::kEnableScrollPrediction)},
 870 #if defined(ENABLE_TOPCHROME_MD)
 871     {"top-chrome-md",
 872      IDS_FLAGS_TOP_CHROME_MD,
 873      IDS_FLAGS_TOP_CHROME_MD_DESCRIPTION,
 874      kOsWin | kOsLinux | kOsCrOS,
 875      MULTI_VALUE_TYPE(kTopChromeMaterialDesignChoices)},
 876 #endif
 877     {"touch-events",
 878      IDS_TOUCH_EVENTS_NAME,
 879      IDS_TOUCH_EVENTS_DESCRIPTION,
 880      kOsDesktop,
 881      MULTI_VALUE_TYPE(kTouchEventsChoices)},
 882     {"disable-touch-adjustment",
 883      IDS_DISABLE_TOUCH_ADJUSTMENT_NAME,
 884      IDS_DISABLE_TOUCH_ADJUSTMENT_DESCRIPTION,
 885      kOsWin | kOsLinux | kOsCrOS | kOsAndroid,
 886      SINGLE_VALUE_TYPE(switches::kDisableTouchAdjustment)},
 887 #if defined(OS_CHROMEOS)
 888     {"network-portal-notification",
 889      IDS_FLAGS_NETWORK_PORTAL_NOTIFICATION_NAME,
 890      IDS_FLAGS_NETWORK_PORTAL_NOTIFICATION_DESCRIPTION,
 891      kOsCrOS,
 892      ENABLE_DISABLE_VALUE_TYPE(
 893          chromeos::switches::kEnableNetworkPortalNotification,
 894          chromeos::switches::kDisableNetworkPortalNotification)},
 895 #endif
 896     {"enable-download-resumption",
 897      IDS_FLAGS_ENABLE_DOWNLOAD_RESUMPTION_NAME,
 898      IDS_FLAGS_ENABLE_DOWNLOAD_RESUMPTION_DESCRIPTION,
 899      kOsDesktop,
 900      SINGLE_VALUE_TYPE(switches::kEnableDownloadResumption)},
 901     {"enable-download-notification",
 902      IDS_FLAGS_ENABLE_DOWNLOAD_NOTIFICATION_NAME,
 903      IDS_FLAGS_ENABLE_DOWNLOAD_NOTIFICATION_DESCRIPTION,
 904      kOsDesktop,
 905      MULTI_VALUE_TYPE(kDownloadNotificationChoices)},
 906 #if defined(ENABLE_PLUGINS)
 907     {"allow-nacl-socket-api",
 908      IDS_FLAGS_ALLOW_NACL_SOCKET_API_NAME,
 909      IDS_FLAGS_ALLOW_NACL_SOCKET_API_DESCRIPTION,
 910      kOsDesktop,
 911      SINGLE_VALUE_TYPE_AND_VALUE(switches::kAllowNaClSocketAPI, "*")},
 912 #endif
 913 #if defined(OS_CHROMEOS)
 914     {"allow-touchpad-three-finger-click",
 915      IDS_FLAGS_ALLOW_TOUCHPAD_THREE_FINGER_CLICK_NAME,
 916      IDS_FLAGS_ALLOW_TOUCHPAD_THREE_FINGER_CLICK_DESCRIPTION,
 917      kOsCrOS,
 918      SINGLE_VALUE_TYPE(chromeos::switches::kEnableTouchpadThreeFingerClick)},
 919     {"ash-enable-unified-desktop",
 920      IDS_FLAGS_ASH_ENABLE_UNIFIED_DESKTOP_NAME,
 921      IDS_FLAGS_ASH_ENABLE_UNIFIED_DESKTOP_DESCRIPTION,
 922      kOsCrOS,
 923      SINGLE_VALUE_TYPE(ash::switches::kAshEnableUnifiedDesktop)},
 924     {"enable-easy-unlock-proximity-detection",
 925      IDS_FLAGS_ENABLE_EASY_UNLOCK_PROXIMITY_DETECTION_NAME,
 926      IDS_FLAGS_ENABLE_EASY_UNLOCK_PROXIMITY_DETECTION_DESCRIPTION,
 927      kOsCrOS,
 928      SINGLE_VALUE_TYPE(proximity_auth::switches::kEnableProximityDetection)},
 929     {"enable-easy-unlock-bluetooth-low-energy-detection",
 930      IDS_FLAGS_ENABLE_EASY_UNLOCK_BLUETOOTH_LOW_ENERGY_DISCOVERY_NAME,
 931      IDS_FLAGS_ENABLE_EASY_UNLOCK_BLUETOOTH_LOW_ENERGY_DISCOVERY_DESCRIPTION,
 932      kOsCrOS,
 933      SINGLE_VALUE_TYPE(
 934          proximity_auth::switches::kEnableBluetoothLowEnergyDiscovery)},
 935 #endif
 936 #if defined(USE_ASH)
 937     {"disable-minimize-on-second-launcher-item-click",
 938      IDS_FLAGS_DISABLE_MINIMIZE_ON_SECOND_LAUNCHER_ITEM_CLICK_NAME,
 939      IDS_FLAGS_DISABLE_MINIMIZE_ON_SECOND_LAUNCHER_ITEM_CLICK_DESCRIPTION,
 940      kOsAll,
 941      SINGLE_VALUE_TYPE(switches::kDisableMinimizeOnSecondLauncherItemClick)},
 942     {"show-touch-hud",
 943      IDS_FLAGS_SHOW_TOUCH_HUD_NAME,
 944      IDS_FLAGS_SHOW_TOUCH_HUD_DESCRIPTION,
 945      kOsAll,
 946      SINGLE_VALUE_TYPE(ash::switches::kAshTouchHud)},
 947     {
 948      "enable-pinch",
 949      IDS_FLAGS_ENABLE_PINCH_SCALE_NAME,
 950      IDS_FLAGS_ENABLE_PINCH_SCALE_DESCRIPTION,
 951      kOsLinux | kOsWin | kOsCrOS,
 952      ENABLE_DISABLE_VALUE_TYPE(switches::kEnablePinch, switches::kDisablePinch),
 953     },
 954 #endif  // defined(USE_ASH)
 955 #if defined(OS_CHROMEOS)
 956     {
 957      "disable-boot-animation",
 958      IDS_FLAGS_DISABLE_BOOT_ANIMATION,
 959      IDS_FLAGS_DISABLE_BOOT_ANIMATION_DESCRIPTION,
 960      kOsCrOSOwnerOnly,
 961      SINGLE_VALUE_TYPE(chromeos::switches::kDisableBootAnimation),
 962     },
 963     {"enable-video-player-chromecast-support",
 964      IDS_FLAGS_ENABLE_VIDEO_PLAYER_CHROMECAST_SUPPORT_NAME,
 965      IDS_FLAGS_ENABLE_VIDEO_PLAYER_CHROMECAST_SUPPORT_DESCRIPTION,
 966      kOsCrOS,
 967      SINGLE_VALUE_TYPE(
 968          chromeos::switches::kEnableVideoPlayerChromecastSupport)},
 969     {
 970      "disable-office-editing-component-app",
 971      IDS_FLAGS_DISABLE_OFFICE_EDITING_COMPONENT_APP_NAME,
 972      IDS_FLAGS_DISABLE_OFFICE_EDITING_COMPONENT_APP_DESCRIPTION,
 973      kOsCrOS,
 974      SINGLE_VALUE_TYPE(chromeos::switches::kDisableOfficeEditingComponentApp),
 975     },
 976     {
 977      "disable-display-color-calibration",
 978      IDS_FLAGS_DISABLE_DISPLAY_COLOR_CALIBRATION_NAME,
 979      IDS_FLAGS_DISABLE_DISPLAY_COLOR_CALIBRATION_DESCRIPTION,
 980      kOsCrOS,
 981      SINGLE_VALUE_TYPE(ui::switches::kDisableDisplayColorCalibration),
 982     },
 983     {
 984      "ash-disable-screen-orientation-lock",
 985      IDS_FLAGS_ASH_DISABLE_SCREEN_ORIENTATION_LOCK_NAME,
 986      IDS_FLAGS_ASH_DISABLE_SCREEN_ORIENTATION_LOCK_DESCRIPTION,
 987      kOsCrOS,
 988      SINGLE_VALUE_TYPE(ash::switches::kAshDisableScreenOrientationLock),
 989     },
 990 #endif  // defined(OS_CHROMEOS)
 991     {
 992      "disable-accelerated-video-decode",
 993      IDS_FLAGS_DISABLE_ACCELERATED_VIDEO_DECODE_NAME,
 994      IDS_FLAGS_DISABLE_ACCELERATED_VIDEO_DECODE_DESCRIPTION,
 995      kOsMac | kOsWin | kOsCrOS,
 996      SINGLE_VALUE_TYPE(switches::kDisableAcceleratedVideoDecode),
 997     },
 998 #if defined(USE_ASH)
 999     {
1000      "ash-debug-shortcuts",
1001      IDS_FLAGS_DEBUG_SHORTCUTS_NAME,
1002      IDS_FLAGS_DEBUG_SHORTCUTS_DESCRIPTION,
1003      kOsAll,
1004      SINGLE_VALUE_TYPE(ash::switches::kAshDebugShortcuts),
1005     },
1006     {
1007      "ash-disable-maximize-mode-window-backdrop",
1008      IDS_FLAGS_ASH_DISABLE_MAXIMIZE_MODE_WINDOW_BACKDROP_NAME,
1009      IDS_FLAGS_ASH_DISABLE_MAXIMIZE_MODE_WINDOW_BACKDROP_DESCRIPTION,
1010      kOsCrOS,
1011      SINGLE_VALUE_TYPE(ash::switches::kAshDisableMaximizeModeWindowBackdrop),
1012     },
1013     {
1014      "ash-enable-touch-view-testing",
1015      IDS_FLAGS_ASH_ENABLE_TOUCH_VIEW_TESTING_NAME,
1016      IDS_FLAGS_ASH_ENABLE_TOUCH_VIEW_TESTING_DESCRIPTION,
1017      kOsCrOS,
1018      SINGLE_VALUE_TYPE(ash::switches::kAshEnableTouchViewTesting),
1019     },
1020     {
1021      "disable-touch-feedback",
1022      IDS_FLAGS_DISABLE_TOUCH_FEEDBACK_NAME,
1023      IDS_FLAGS_DISABLE_TOUCH_FEEDBACK_DESCRIPTION,
1024      kOsCrOS,
1025      SINGLE_VALUE_TYPE(switches::kDisableTouchFeedback),
1026     },
1027     {
1028      "ash-enable-mirrored-screen",
1029      IDS_FLAGS_ASH_ENABLE_MIRRORED_SCREEN_NAME,
1030      IDS_FLAGS_ASH_ENABLE_MIRRORED_SCREEN_DESCRIPTION,
1031      kOsCrOS,
1032      SINGLE_VALUE_TYPE(ash::switches::kAshEnableMirroredScreen),
1033     },
1034     {"ash-enable-screen-rotation-animations",
1035      IDS_FLAGS_ASH_ENABLE_SCREEN_ROTATION_ANIMATION_NAME,
1036      IDS_FLAGS_ASH_ENABLE_SCREEN_ROTATION_ANIMATION_DESCRIPTION,
1037      kOsCrOS,
1038      MULTI_VALUE_TYPE(kAshScreenRotationAnimationChoices)},
1039     {
1040      "ash-stable-overview-order",
1041      IDS_FLAGS_ASH_STABLE_OVERVIEW_ORDER_NAME,
1042      IDS_FLAGS_ASH_STABLE_OVERVIEW_ORDER_DESCRIPTION,
1043      kOsCrOS,
1044      ENABLE_DISABLE_VALUE_TYPE(ash::switches::kAshEnableStableOverviewOrder,
1045                                ash::switches::kAshDisableStableOverviewOrder),
1046     },
1047 #endif  // defined(USE_ASH)
1048 #if defined(OS_CHROMEOS)
1049     {"material-design-ink-drop",
1050      IDS_FLAGS_MATERIAL_DESIGN_INK_DROP_NAME,
1051      IDS_FLAGS_MATERIAL_DESIGN_INK_DROP_DESCRIPTION,
1052      kOsCrOS,
1053      MULTI_VALUE_TYPE(kAshMaterialDesignInkDrop)},
1054     {"material-design-ink-drop-animation-speed",
1055      IDS_FLAGS_MATERIAL_DESIGN_INK_DROP_ANIMATION_SPEED_NAME,
1056      IDS_FLAGS_MATERIAL_DESIGN_INK_DROP_ANIMATION_SPEED_DESCRIPTION,
1057      kOsCrOS,
1058      MULTI_VALUE_TYPE(kAshMaterialDesignInkDropAnimationSpeed)},
1059     {"disable-cloud-import",
1060      IDS_FLAGS_DISABLE_CLOUD_IMPORT,
1061      IDS_FLAGS_DISABLE_CLOUD_IMPORT_DESCRIPTION,
1062      kOsCrOS,
1063      SINGLE_VALUE_TYPE(chromeos::switches::kDisableCloudImport)},
1064     {"enable-request-tablet-site",
1065      IDS_FLAGS_ENABLE_REQUEST_TABLET_SITE_NAME,
1066      IDS_FLAGS_ENABLE_REQUEST_TABLET_SITE_DESCRIPTION,
1067      kOsCrOS,
1068      SINGLE_VALUE_TYPE(chromeos::switches::kEnableRequestTabletSite)},
1069 #endif
1070     {"debug-packed-apps",
1071      IDS_FLAGS_DEBUG_PACKED_APP_NAME,
1072      IDS_FLAGS_DEBUG_PACKED_APP_DESCRIPTION,
1073      kOsDesktop,
1074      SINGLE_VALUE_TYPE(switches::kDebugPackedApps)},
1075     {"enable-password-generation",
1076      IDS_FLAGS_ENABLE_PASSWORD_GENERATION_NAME,
1077      IDS_FLAGS_ENABLE_PASSWORD_GENERATION_DESCRIPTION,
1078      kOsWin | kOsLinux | kOsCrOS | kOsMac | kOsAndroid,
1079      ENABLE_DISABLE_VALUE_TYPE(autofill::switches::kEnablePasswordGeneration,
1080                                autofill::switches::kDisablePasswordGeneration)},
1081     {"enable-automatic-password-saving",
1082      IDS_FLAGS_ENABLE_AUTOMATIC_PASSWORD_SAVING_NAME,
1083      IDS_FLAGS_ENABLE_AUTOMATIC_PASSWORD_SAVING_DESCRIPTION,
1084      kOsDesktop,
1085      SINGLE_VALUE_TYPE(
1086          password_manager::switches::kEnableAutomaticPasswordSaving)},
1087     {"password-manager-reauthentication",
1088      IDS_FLAGS_PASSWORD_MANAGER_REAUTHENTICATION_NAME,
1089      IDS_FLAGS_PASSWORD_MANAGER_REAUTHENTICATION_DESCRIPTION,
1090      kOsMac | kOsWin,
1091      SINGLE_VALUE_TYPE(switches::kDisablePasswordManagerReauthentication)},
1092     {"enable-password-change-support",
1093      IDS_FLAGS_ENABLE_PASSWORD_CHANGE_SUPPORT_NAME,
1094      IDS_FLAGS_ENABLE_PASSWORD_CHANGE_SUPPORT_DESCRIPTION,
1095      kOsMac,
1096      SINGLE_VALUE_TYPE(
1097          password_manager::switches::kEnablePasswordChangeSupport)},
1098     {"enable-password-force-saving",
1099      IDS_FLAGS_ENABLE_PASSWORD_FORCE_SAVING_NAME,
1100      IDS_FLAGS_ENABLE_PASSWORD_FORCE_SAVING_DESCRIPTION,
1101      kOsAll,
1102      SINGLE_VALUE_TYPE(password_manager::switches::kEnablePasswordForceSaving)},
1103     {"enable-password-link",
1104      IDS_FLAGS_PASSWORD_MANAGER_LINK_NAME,
1105      IDS_FLAGS_PASSWORD_MANAGER_LINK_DESCRIPTION,
1106      kOsAndroid | kOsDesktop,
1107      ENABLE_DISABLE_VALUE_TYPE(
1108          password_manager::switches::kEnablePasswordLink,
1109          password_manager::switches::kDisablePasswordLink)},
1110     {"enable-affiliation-based-matching",
1111      IDS_FLAGS_ENABLE_AFFILIATION_BASED_MATCHING_NAME,
1112      IDS_FLAGS_ENABLE_AFFILIATION_BASED_MATCHING_DESCRIPTION,
1113      kOsWin | kOsLinux | kOsCrOS | kOsMac | kOsAndroid,
1114      ENABLE_DISABLE_VALUE_TYPE(
1115          password_manager::switches::kEnableAffiliationBasedMatching,
1116          password_manager::switches::kDisableAffiliationBasedMatching)},
1117     {"wallet-service-use-sandbox",
1118      IDS_FLAGS_WALLET_SERVICE_USE_SANDBOX_NAME,
1119      IDS_FLAGS_WALLET_SERVICE_USE_SANDBOX_DESCRIPTION,
1120      kOsAndroid | kOsDesktop,
1121      ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(
1122          autofill::switches::kWalletServiceUseSandbox,
1123          "1",
1124          autofill::switches::kWalletServiceUseSandbox,
1125          "0")},
1126 #if defined(USE_AURA)
1127     {"overscroll-history-navigation",
1128      IDS_FLAGS_OVERSCROLL_HISTORY_NAVIGATION_NAME,
1129      IDS_FLAGS_OVERSCROLL_HISTORY_NAVIGATION_DESCRIPTION,
1130      kOsAll,
1131      MULTI_VALUE_TYPE(kOverscrollHistoryNavigationChoices)},
1132 #endif
1133     {"scroll-end-effect",
1134      IDS_FLAGS_SCROLL_END_EFFECT_NAME,
1135      IDS_FLAGS_SCROLL_END_EFFECT_DESCRIPTION,
1136      kOsCrOS,
1137      ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(switches::kScrollEndEffect,
1138                                          "1",
1139                                          switches::kScrollEndEffect,
1140                                          "0")},
1141     {"enable-icon-ntp",
1142      IDS_FLAGS_ENABLE_ICON_NTP_NAME,
1143      IDS_FLAGS_ENABLE_ICON_NTP_DESCRIPTION,
1144      kOsAndroid | kOsMac | kOsWin | kOsLinux | kOsCrOS,
1145      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableIconNtp,
1146                                switches::kDisableIconNtp)},
1147     {"enable-touch-drag-drop",
1148      IDS_FLAGS_ENABLE_TOUCH_DRAG_DROP_NAME,
1149      IDS_FLAGS_ENABLE_TOUCH_DRAG_DROP_DESCRIPTION,
1150      kOsWin | kOsCrOS,
1151      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableTouchDragDrop,
1152                                switches::kDisableTouchDragDrop)},
1153     {"enable-touch-editing",
1154      IDS_FLAGS_ENABLE_TOUCH_EDITING_NAME,
1155      IDS_FLAGS_ENABLE_TOUCH_EDITING_DESCRIPTION,
1156      kOsCrOS | kOsWin | kOsLinux,
1157      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableTouchEditing,
1158                                switches::kDisableTouchEditing)},
1159     {"touch-selection-strategy",
1160      IDS_FLAGS_TOUCH_SELECTION_STRATEGY_NAME,
1161      IDS_FLAGS_TOUCH_SELECTION_STRATEGY_DESCRIPTION,
1162      kOsAndroid,  // TODO(mfomitchev): Add CrOS/Win/Linux support soon.
1163      MULTI_VALUE_TYPE(kTouchTextSelectionStrategyChoices)},
1164     {"enable-suggestions-service",
1165      IDS_FLAGS_ENABLE_SUGGESTIONS_SERVICE_NAME,
1166      IDS_FLAGS_ENABLE_SUGGESTIONS_SERVICE_DESCRIPTION,
1167      kOsAndroid | kOsCrOS,
1168      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSuggestionsService,
1169                                switches::kDisableSuggestionsService)},
1170     {"enable-suggestions-with-substring-match",
1171      IDS_FLAGS_ENABLE_SUGGESTIONS_WITH_SUB_STRING_MATCH_NAME,
1172      IDS_FLAGS_ENABLE_SUGGESTIONS_WITH_SUB_STRING_MATCH_DESCRIPTION,
1173      kOsAll,
1174      SINGLE_VALUE_TYPE(
1175          autofill::switches::kEnableSuggestionsWithSubstringMatch)},
1176     {"enable-supervised-user-managed-bookmarks-folder",
1177      IDS_FLAGS_ENABLE_SUPERVISED_USER_MANAGED_BOOKMARKS_FOLDER_NAME,
1178      IDS_FLAGS_ENABLE_SUPERVISED_USER_MANAGED_BOOKMARKS_FOLDER_DESCRIPTION,
1179      kOsAndroid | kOsMac | kOsWin | kOsLinux | kOsCrOS,
1180      SINGLE_VALUE_TYPE(switches::kEnableSupervisedUserManagedBookmarksFolder)},
1181 #if defined(ENABLE_APP_LIST)
1182     {"enable-sync-app-list",
1183      IDS_FLAGS_ENABLE_SYNC_APP_LIST_NAME,
1184      IDS_FLAGS_ENABLE_SYNC_APP_LIST_DESCRIPTION,
1185      kOsDesktop,
1186      ENABLE_DISABLE_VALUE_TYPE(app_list::switches::kEnableSyncAppList,
1187                                app_list::switches::kDisableSyncAppList)},
1188 #endif
1189 #if defined(OS_MACOSX)
1190     {"enable-avfoundation",
1191      IDS_FLAGS_ENABLE_AVFOUNDATION_NAME,
1192      IDS_FLAGS_ENABLE_AVFOUNDATION_DESCRIPTION,
1193      kOsMac,
1194      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAVFoundation,
1195                                switches::kForceQTKit)},
1196 #endif
1197     {"lcd-text-aa",
1198      IDS_FLAGS_LCD_TEXT_NAME,
1199      IDS_FLAGS_LCD_TEXT_DESCRIPTION,
1200      kOsDesktop,
1201      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableLCDText,
1202                                switches::kDisableLCDText)},
1203 #if defined(OS_ANDROID) || defined(OS_MACOSX)
1204     {"delegated-renderer",
1205      IDS_FLAGS_DELEGATED_RENDERER_NAME,
1206      IDS_FLAGS_DELEGATED_RENDERER_DESCRIPTION,
1207      kOsAndroid,  // TODO(ccameron) Add mac support soon.
1208      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableDelegatedRenderer,
1209                                switches::kDisableDelegatedRenderer)},
1210 #endif
1211     {"enable-offer-store-unmasked-wallet-cards",
1212      IDS_FLAGS_ENABLE_OFFER_STORE_UNMASKED_WALLET_CARDS,
1213      IDS_FLAGS_ENABLE_OFFER_STORE_UNMASKED_WALLET_CARDS_DESCRIPTION,
1214      kOsAll,
1215      ENABLE_DISABLE_VALUE_TYPE(
1216          autofill::switches::kEnableOfferStoreUnmaskedWalletCards,
1217          autofill::switches::kDisableOfferStoreUnmaskedWalletCards)},
1218     {"enable-offline-auto-reload",
1219      IDS_FLAGS_ENABLE_OFFLINE_AUTO_RELOAD_NAME,
1220      IDS_FLAGS_ENABLE_OFFLINE_AUTO_RELOAD_DESCRIPTION,
1221      kOsAll,
1222      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableOfflineAutoReload,
1223                                switches::kDisableOfflineAutoReload)},
1224     {"enable-offline-auto-reload-visible-only",
1225      IDS_FLAGS_ENABLE_OFFLINE_AUTO_RELOAD_VISIBLE_ONLY_NAME,
1226      IDS_FLAGS_ENABLE_OFFLINE_AUTO_RELOAD_VISIBLE_ONLY_DESCRIPTION,
1227      kOsAll,
1228      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableOfflineAutoReloadVisibleOnly,
1229                                switches::kDisableOfflineAutoReloadVisibleOnly)},
1230     {"show-saved-copy",
1231      IDS_FLAGS_SHOW_SAVED_COPY_NAME,
1232      IDS_FLAGS_SHOW_SAVED_COPY_DESCRIPTION,
1233      kOsAll,
1234      MULTI_VALUE_TYPE(kShowSavedCopyChoices)},
1235     {"default-tile-width",
1236      IDS_FLAGS_DEFAULT_TILE_WIDTH_NAME,
1237      IDS_FLAGS_DEFAULT_TILE_WIDTH_DESCRIPTION,
1238      kOsAll,
1239      MULTI_VALUE_TYPE(kDefaultTileWidthChoices)},
1240     {"default-tile-height",
1241      IDS_FLAGS_DEFAULT_TILE_HEIGHT_NAME,
1242      IDS_FLAGS_DEFAULT_TILE_HEIGHT_DESCRIPTION,
1243      kOsAll,
1244      MULTI_VALUE_TYPE(kDefaultTileHeightChoices)},
1245 #if defined(OS_ANDROID)
1246     {"disable-gesture-requirement-for-media-playback",
1247      IDS_FLAGS_DISABLE_GESTURE_REQUIREMENT_FOR_MEDIA_PLAYBACK_NAME,
1248      IDS_FLAGS_DISABLE_GESTURE_REQUIREMENT_FOR_MEDIA_PLAYBACK_DESCRIPTION,
1249      kOsAndroid,
1250      SINGLE_VALUE_TYPE(switches::kDisableGestureRequirementForMediaPlayback)},
1251 #endif
1252 #if defined(OS_CHROMEOS)
1253     {"enable-virtual-keyboard",
1254      IDS_FLAGS_ENABLE_VIRTUAL_KEYBOARD_NAME,
1255      IDS_FLAGS_ENABLE_VIRTUAL_KEYBOARD_DESCRIPTION,
1256      kOsCrOS,
1257      SINGLE_VALUE_TYPE(keyboard::switches::kEnableVirtualKeyboard)},
1258     {"enable-virtual-keyboard-overscroll",
1259      IDS_FLAGS_ENABLE_VIRTUAL_KEYBOARD_OVERSCROLL_NAME,
1260      IDS_FLAGS_ENABLE_VIRTUAL_KEYBOARD_OVERSCROLL_DESCRIPTION,
1261      kOsCrOS,
1262      ENABLE_DISABLE_VALUE_TYPE(
1263          keyboard::switches::kEnableVirtualKeyboardOverscroll,
1264          keyboard::switches::kDisableVirtualKeyboardOverscroll)},
1265     {"enable-input-view",
1266      IDS_FLAGS_ENABLE_INPUT_VIEW_NAME,
1267      IDS_FLAGS_ENABLE_INPUT_VIEW_DESCRIPTION,
1268      kOsCrOS,
1269      ENABLE_DISABLE_VALUE_TYPE(keyboard::switches::kEnableInputView,
1270                                keyboard::switches::kDisableInputView)},
1271     {"disable-new-korean-ime",
1272      IDS_FLAGS_DISABLE_NEW_KOREAN_IME_NAME,
1273      IDS_FLAGS_DISABLE_NEW_KOREAN_IME_DESCRIPTION,
1274      kOsCrOS,
1275      SINGLE_VALUE_TYPE(chromeos::switches::kDisableNewKoreanIme)},
1276     {"enable-physical-keyboard-autocorrect",
1277      IDS_FLAGS_ENABLE_PHYSICAL_KEYBOARD_AUTOCORRECT_NAME,
1278      IDS_FLAGS_ENABLE_PHYSICAL_KEYBOARD_AUTOCORRECT_DESCRIPTION,
1279      kOsCrOS,
1280      ENABLE_DISABLE_VALUE_TYPE(
1281          chromeos::switches::kEnablePhysicalKeyboardAutocorrect,
1282          chromeos::switches::kDisablePhysicalKeyboardAutocorrect)},
1283     {"disable-voice-input",
1284      IDS_FLAGS_DISABLE_VOICE_INPUT_NAME,
1285      IDS_FLAGS_DISABLE_VOICE_INPUT_DESCRIPTION,
1286      kOsCrOS,
1287      SINGLE_VALUE_TYPE(keyboard::switches::kDisableVoiceInput)},
1288     {"enable-experimental-input-view-features",
1289      IDS_FLAGS_ENABLE_EXPERIMENTAL_INPUT_VIEW_FEATURES_NAME,
1290      IDS_FLAGS_ENABLE_EXPERIMENTAL_INPUT_VIEW_FEATURES_DESCRIPTION,
1291      kOsCrOS,
1292      SINGLE_VALUE_TYPE(
1293          keyboard::switches::kEnableExperimentalInputViewFeatures)},
1294     {"floating-virtual-keyboard",
1295      IDS_FLAGS_FLOATING_VIRTUAL_KEYBOARD_NAME,
1296      IDS_FLAGS_FLOATING_VIRTUAL_KEYBOARD_DESCRIPTION,
1297      kOsCrOS,
1298      MULTI_VALUE_TYPE(kFloatingVirtualKeyboardChoices)},
1299     {"smart-virtual-keyboard",
1300      IDS_FLAGS_SMART_VIRTUAL_KEYBOARD_NAME,
1301      IDS_FLAGS_SMART_VIRTUAL_KEYBOARD_DESCRIPTION,
1302      kOsCrOS,
1303      MULTI_VALUE_TYPE(kSmartVirtualKeyboardChoices)},
1304     {"gesture-typing",
1305      IDS_FLAGS_GESTURE_TYPING_NAME,
1306      IDS_FLAGS_GESTURE_TYPING_DESCRIPTION,
1307      kOsCrOS,
1308      MULTI_VALUE_TYPE(kGestureTypingChoices)},
1309     {"gesture-editing",
1310      IDS_FLAGS_GESTURE_EDITING_NAME,
1311      IDS_FLAGS_GESTURE_EDITING_DESCRIPTION,
1312      kOsCrOS,
1313      MULTI_VALUE_TYPE(kGestureEditingChoices)},
1314     {"enable-fullscreen-app-list",
1315      IDS_FLAGS_FULLSCREEN_APP_LIST_NAME,
1316      IDS_FLAGS_FULLSCREEN_APP_LIST_DESCRIPTION,
1317      kOsCrOS,
1318      SINGLE_VALUE_TYPE(ash::switches::kAshEnableFullscreenAppList)},
1319 #endif
1320     {"enable-simple-cache-backend",
1321      IDS_FLAGS_ENABLE_SIMPLE_CACHE_BACKEND_NAME,
1322      IDS_FLAGS_ENABLE_SIMPLE_CACHE_BACKEND_DESCRIPTION,
1323      kOsWin | kOsMac | kOsLinux | kOsCrOS,
1324      MULTI_VALUE_TYPE(kSimpleCacheBackendChoices)},
1325     {"enable-tcp-fast-open",
1326      IDS_FLAGS_ENABLE_TCP_FAST_OPEN_NAME,
1327      IDS_FLAGS_ENABLE_TCP_FAST_OPEN_DESCRIPTION,
1328      kOsLinux | kOsCrOS | kOsAndroid,
1329      SINGLE_VALUE_TYPE(switches::kEnableTcpFastOpen)},
1330 #if defined(ENABLE_SERVICE_DISCOVERY)
1331     {"device-discovery-notifications",
1332      IDS_FLAGS_DEVICE_DISCOVERY_NOTIFICATIONS_NAME,
1333      IDS_FLAGS_DEVICE_DISCOVERY_NOTIFICATIONS_DESCRIPTION,
1334      kOsDesktop,
1335      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableDeviceDiscoveryNotifications,
1336                                switches::kDisableDeviceDiscoveryNotifications)},
1337     {"enable-print-preview-register-promos",
1338      IDS_FLAGS_ENABLE_PRINT_PREVIEW_REGISTER_PROMOS_NAME,
1339      IDS_FLAGS_ENABLE_PRINT_PREVIEW_REGISTER_PROMOS_DESCRIPTION,
1340      kOsDesktop,
1341      SINGLE_VALUE_TYPE(switches::kEnablePrintPreviewRegisterPromos)},
1342 #endif  // ENABLE_SERVICE_DISCOVERY
1343 #if defined(OS_WIN)
1344     {"enable-cloud-print-xps",
1345      IDS_FLAGS_ENABLE_CLOUD_PRINT_XPS_NAME,
1346      IDS_FLAGS_ENABLE_CLOUD_PRINT_XPS_DESCRIPTION,
1347      kOsWin,
1348      SINGLE_VALUE_TYPE(switches::kEnableCloudPrintXps)},
1349 #endif
1350 #if defined(USE_AURA)
1351     {"tab-capture-upscale-quality",
1352      IDS_FLAGS_TAB_CAPTURE_UPSCALE_QUALITY_NAME,
1353      IDS_FLAGS_TAB_CAPTURE_UPSCALE_QUALITY_DESCRIPTION,
1354      kOsAll,
1355      MULTI_VALUE_TYPE(kTabCaptureUpscaleQualityChoices)},
1356     {"tab-capture-downscale-quality",
1357      IDS_FLAGS_TAB_CAPTURE_DOWNSCALE_QUALITY_NAME,
1358      IDS_FLAGS_TAB_CAPTURE_DOWNSCALE_QUALITY_DESCRIPTION,
1359      kOsAll,
1360      MULTI_VALUE_TYPE(kTabCaptureDownscaleQualityChoices)},
1361 #endif
1362 #if defined(TOOLKIT_VIEWS)
1363     {"disable-hide-inactive-stacked-tab-close-buttons",
1364      IDS_FLAGS_DISABLE_HIDE_INACTIVE_STACKED_TAB_CLOSE_BUTTONS_NAME,
1365      IDS_FLAGS_DISABLE_HIDE_INACTIVE_STACKED_TAB_CLOSE_BUTTONS_DESCRIPTION,
1366      kOsCrOS | kOsWin | kOsLinux,
1367      SINGLE_VALUE_TYPE(switches::kDisableHideInactiveStackedTabCloseButtons)},
1368 #endif
1369 #if defined(ENABLE_SPELLCHECK)
1370     {"enable-spelling-feedback-field-trial",
1371      IDS_FLAGS_ENABLE_SPELLING_FEEDBACK_FIELD_TRIAL_NAME,
1372      IDS_FLAGS_ENABLE_SPELLING_FEEDBACK_FIELD_TRIAL_DESCRIPTION,
1373      kOsAll,
1374      SINGLE_VALUE_TYPE(switches::kEnableSpellingFeedbackFieldTrial)},
1375 #endif
1376     {"enable-webgl-draft-extensions",
1377      IDS_FLAGS_ENABLE_WEBGL_DRAFT_EXTENSIONS_NAME,
1378      IDS_FLAGS_ENABLE_WEBGL_DRAFT_EXTENSIONS_DESCRIPTION,
1379      kOsAll,
1380      SINGLE_VALUE_TYPE(switches::kEnableWebGLDraftExtensions)},
1381     {"enable-new-profile-management",
1382      IDS_FLAGS_ENABLE_NEW_PROFILE_MANAGEMENT_NAME,
1383      IDS_FLAGS_ENABLE_NEW_PROFILE_MANAGEMENT_DESCRIPTION,
1384      kOsAndroid | kOsMac | kOsWin | kOsLinux | kOsCrOS,
1385      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableNewProfileManagement,
1386                                switches::kDisableNewProfileManagement)},
1387     {"enable-account-consistency",
1388      IDS_FLAGS_ENABLE_ACCOUNT_CONSISTENCY_NAME,
1389      IDS_FLAGS_ENABLE_ACCOUNT_CONSISTENCY_DESCRIPTION,
1390      kOsAndroid | kOsMac | kOsWin | kOsLinux | kOsCrOS,
1391      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAccountConsistency,
1392                                switches::kDisableAccountConsistency)},
1393     {"enable-iframe-based-signin",
1394      IDS_FLAGS_ENABLE_IFRAME_BASED_SIGNIN_NAME,
1395      IDS_FLAGS_ENABLE_IFRAME_BASED_SIGNIN_DESCRIPTION,
1396      kOsMac | kOsWin | kOsLinux,
1397      SINGLE_VALUE_TYPE(switches::kEnableIframeBasedSignin)},
1398     {"enable-google-profile-info",
1399      IDS_FLAGS_ENABLE_GOOGLE_PROFILE_INFO_NAME,
1400      IDS_FLAGS_ENABLE_GOOGLE_PROFILE_INFO_DESCRIPTION,
1401      kOsMac | kOsWin | kOsLinux,
1402      SINGLE_VALUE_TYPE(switches::kGoogleProfileInfo)},
1403 #if defined(ENABLE_APP_LIST)
1404     {"reset-app-list-install-state",
1405      IDS_FLAGS_RESET_APP_LIST_INSTALL_STATE_NAME,
1406      IDS_FLAGS_RESET_APP_LIST_INSTALL_STATE_DESCRIPTION,
1407      kOsMac | kOsWin | kOsLinux,
1408      SINGLE_VALUE_TYPE(app_list::switches::kResetAppListInstallState)},
1409 #endif
1410 #if defined(OS_ANDROID)
1411     {"enable-accessibility-tab-switcher",
1412      IDS_FLAGS_ENABLE_ACCESSIBILITY_TAB_SWITCHER_NAME,
1413      IDS_FLAGS_ENABLE_ACCESSIBILITY_TAB_SWITCHER_DESCRIPTION,
1414      kOsAndroid,
1415      SINGLE_VALUE_TYPE(switches::kEnableAccessibilityTabSwitcher)},
1416     {// TODO(dmazzoni): remove this flag when native android accessibility
1417      // ships in the stable channel. http://crbug.com/356775
1418      "enable-accessibility-script-injection",
1419      IDS_FLAGS_ENABLE_ACCESSIBILITY_SCRIPT_INJECTION_NAME,
1420      IDS_FLAGS_ENABLE_ACCESSIBILITY_SCRIPT_INJECTION_DESCRIPTION,
1421      kOsAndroid,
1422      // Java-only switch: ContentSwitches.ENABLE_ACCESSIBILITY_SCRIPT_INJECTION.
1423      SINGLE_VALUE_TYPE("enable-accessibility-script-injection")},
1424 #endif
1425     {"enable-zero-copy",
1426      IDS_FLAGS_ENABLE_ZERO_COPY_NAME,
1427      IDS_FLAGS_ENABLE_ZERO_COPY_DESCRIPTION,
1428      kOsAll,
1429      SINGLE_VALUE_TYPE(switches::kEnableZeroCopy)},
1430 #if defined(OS_CHROMEOS)
1431     {"enable-first-run-ui-transitions",
1432      IDS_FLAGS_ENABLE_FIRST_RUN_UI_TRANSITIONS_NAME,
1433      IDS_FLAGS_ENABLE_FIRST_RUN_UI_TRANSITIONS_DESCRIPTION,
1434      kOsCrOS,
1435      SINGLE_VALUE_TYPE(chromeos::switches::kEnableFirstRunUITransitions)},
1436 #endif
1437     {"disable-new-bookmark-apps",
1438      IDS_FLAGS_NEW_BOOKMARK_APPS_NAME,
1439      IDS_FLAGS_NEW_BOOKMARK_APPS_DESCRIPTION,
1440      kOsWin | kOsCrOS | kOsLinux | kOsMac,
1441      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableNewBookmarkApps,
1442                                switches::kDisableNewBookmarkApps)},
1443 #if defined(OS_MACOSX)
1444     {"disable-hosted-apps-in-windows",
1445      IDS_FLAGS_HOSTED_APPS_IN_WINDOWS_NAME,
1446      IDS_FLAGS_HOSTED_APPS_IN_WINDOWS_DESCRIPTION,
1447      kOsMac,
1448      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableHostedAppsInWindows,
1449                                switches::kDisableHostedAppsInWindows)},
1450     {"disable-hosted-app-shim-creation",
1451      IDS_FLAGS_DISABLE_HOSTED_APP_SHIM_CREATION_NAME,
1452      IDS_FLAGS_DISABLE_HOSTED_APP_SHIM_CREATION_DESCRIPTION,
1453      kOsMac,
1454      SINGLE_VALUE_TYPE(switches::kDisableHostedAppShimCreation)},
1455     {"enable-hosted-app-quit-notification",
1456      IDS_FLAGS_ENABLE_HOSTED_APP_QUIT_NOTIFICATION_NAME,
1457      IDS_FLAGS_ENABLE_HOSTED_APP_QUIT_NOTIFICATION_DESCRIPTION,
1458      kOsMac,
1459      SINGLE_VALUE_TYPE(switches::kHostedAppQuitNotification)},
1460 #endif
1461     {"enable-ephemeral-apps-in-webstore",
1462      IDS_FLAGS_ENABLE_EPHEMERAL_APPS_IN_WEBSTORE_NAME,
1463      IDS_FLAGS_ENABLE_EPHEMERAL_APPS_IN_WEBSTORE_DESCRIPTION,
1464      kOsAll,
1465      SINGLE_VALUE_TYPE(switches::kEnableEphemeralAppsInWebstore)},
1466 #if defined(OS_ANDROID)
1467     {"disable-pull-to-refresh-effect",
1468      IDS_FLAGS_DISABLE_PULL_TO_REFRESH_EFFECT_NAME,
1469      IDS_FLAGS_DISABLE_PULL_TO_REFRESH_EFFECT_DESCRIPTION,
1470      kOsAndroid,
1471      SINGLE_VALUE_TYPE(switches::kDisablePullToRefreshEffect)},
1472 #endif
1473 #if defined(OS_MACOSX)
1474     {"enable-translate-new-ux",
1475      IDS_FLAGS_ENABLE_TRANSLATE_NEW_UX_NAME,
1476      IDS_FLAGS_ENABLE_TRANSLATE_NEW_UX_DESCRIPTION,
1477      kOsMac,
1478      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableTranslateNewUX,
1479                                switches::kDisableTranslateNewUX)},
1480 #endif
1481 #if defined(TOOLKIT_VIEWS)
1482     {"disable-views-rect-based-targeting",  // FLAGS:RECORD_UMA
1483      IDS_FLAGS_DISABLE_VIEWS_RECT_BASED_TARGETING_NAME,
1484      IDS_FLAGS_DISABLE_VIEWS_RECT_BASED_TARGETING_DESCRIPTION,
1485      kOsCrOS | kOsWin | kOsLinux,
1486      SINGLE_VALUE_TYPE(views::switches::kDisableViewsRectBasedTargeting)},
1487     {"enable-link-disambiguation-popup",
1488      IDS_FLAGS_ENABLE_LINK_DISAMBIGUATION_POPUP_NAME,
1489      IDS_FLAGS_ENABLE_LINK_DISAMBIGUATION_POPUP_DESCRIPTION,
1490      kOsCrOS | kOsWin,
1491      SINGLE_VALUE_TYPE(switches::kEnableLinkDisambiguationPopup)},
1492 #endif
1493 #if defined(ENABLE_EXTENSIONS)
1494     {"enable-apps-show-on-first-paint",
1495      IDS_FLAGS_ENABLE_APPS_SHOW_ON_FIRST_PAINT_NAME,
1496      IDS_FLAGS_ENABLE_APPS_SHOW_ON_FIRST_PAINT_DESCRIPTION,
1497      kOsDesktop,
1498      SINGLE_VALUE_TYPE(extensions::switches::kEnableAppsShowOnFirstPaint)},
1499 #endif
1500     {"enhanced-bookmarks-experiment",
1501      IDS_FLAGS_ENABLE_ENHANCED_BOOKMARKS_NAME,
1502      IDS_FLAGS_ENABLE_ENHANCED_BOOKMARKS_DESCRIPTION,
1503      kOsDesktop | kOsAndroid,
1504      ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(switches::kEnhancedBookmarksExperiment,
1505                                          "1",
1506                                          switches::kEnhancedBookmarksExperiment,
1507                                          "0")},
1508 #if defined(OS_ANDROID)
1509     {"enable-zero-suggest-experiment",
1510      IDS_FLAGS_ZERO_SUGGEST_EXPERIMENT_NAME,
1511      IDS_FLAGS_ZERO_SUGGEST_EXPERIMENT_DESCRIPTION,
1512      kOsAndroid,
1513      MULTI_VALUE_TYPE(kZeroSuggestExperimentsChoices)},
1514     {"reader-mode-heuristics",
1515      IDS_FLAGS_READER_MODE_HEURISTICS_NAME,
1516      IDS_FLAGS_READER_MODE_HEURISTICS_DESCRIPTION,
1517      kOsAndroid,
1518      MULTI_VALUE_TYPE(kReaderModeHeuristicsChoices)},
1519     {"enable-reader-mode-toolbar-icon",
1520      IDS_FLAGS_READER_MODE_EXPERIMENT_NAME,
1521      IDS_FLAGS_READER_MODE_EXPERIMENT_DESCRIPTION,
1522      kOsAndroid,
1523      SINGLE_VALUE_TYPE(switches::kEnableReaderModeToolbarIcon)},
1524     {"enable-dom-distiller-button-animation",
1525      IDS_FLAGS_READER_MODE_BUTTON_ANIMATION,
1526      IDS_FLAGS_READER_MODE_BUTTON_ANIMATION_DESCRIPTION,
1527      kOsAndroid,
1528      SINGLE_VALUE_TYPE(switches::kEnableDomDistillerButtonAnimation)},
1529 #endif
1530     {"num-raster-threads",
1531      IDS_FLAGS_NUM_RASTER_THREADS_NAME,
1532      IDS_FLAGS_NUM_RASTER_THREADS_DESCRIPTION,
1533      kOsAll,
1534      MULTI_VALUE_TYPE(kNumRasterThreadsChoices)},
1535     {"enable-single-click-autofill",
1536      IDS_FLAGS_ENABLE_SINGLE_CLICK_AUTOFILL_NAME,
1537      IDS_FLAGS_ENABLE_SINGLE_CLICK_AUTOFILL_DESCRIPTION,
1538      kOsCrOS | kOsMac | kOsWin | kOsLinux | kOsAndroid,
1539      ENABLE_DISABLE_VALUE_TYPE(
1540          autofill::switches::kEnableSingleClickAutofill,
1541          autofill::switches::kDisableSingleClickAutofill)},
1542     {"enable-site-engagement-service",
1543      IDS_FLAGS_ENABLE_SITE_ENGAGEMENT_SERVICE_NAME,
1544      IDS_FLAGS_ENABLE_SITE_ENGAGEMENT_SERVICE_DESCRIPTION,
1545      kOsAll,
1546      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSiteEngagementService,
1547                                switches::kDisableSiteEngagementService)},
1548     {"enable-session-crashed-bubble",
1549      IDS_FLAGS_ENABLE_SESSION_CRASHED_BUBBLE_NAME,
1550      IDS_FLAGS_ENABLE_SESSION_CRASHED_BUBBLE_DESCRIPTION,
1551      kOsWin | kOsLinux,
1552      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSessionCrashedBubble,
1553                                switches::kDisableSessionCrashedBubble)},
1554     {"enable-pdf-material-ui",
1555      IDS_FLAGS_PDF_MATERIAL_UI_NAME,
1556      IDS_FLAGS_PDF_MATERIAL_UI_DESCRIPTION,
1557      kOsDesktop,
1558      ENABLE_DISABLE_VALUE_TYPE(switches::kEnablePdfMaterialUI,
1559                                switches::kDisablePdfMaterialUI)},
1560     {"disable-cast-streaming-hw-encoding",
1561      IDS_FLAGS_DISABLE_CAST_STREAMING_HW_ENCODING_NAME,
1562      IDS_FLAGS_DISABLE_CAST_STREAMING_HW_ENCODING_DESCRIPTION,
1563      kOsAll,
1564      SINGLE_VALUE_TYPE(switches::kDisableCastStreamingHWEncoding)},
1565 #if defined(OS_ANDROID)
1566     {"prefetch-search-results",
1567      IDS_FLAGS_PREFETCH_SEARCH_RESULTS_NAME,
1568      IDS_FLAGS_PREFETCH_SEARCH_RESULTS_DESCRIPTION,
1569      kOsAndroid,
1570      SINGLE_VALUE_TYPE(switches::kPrefetchSearchResults)},
1571 #endif
1572 #if defined(ENABLE_APP_LIST)
1573     {"enable-experimental-app-list",
1574      IDS_FLAGS_ENABLE_EXPERIMENTAL_APP_LIST_NAME,
1575      IDS_FLAGS_ENABLE_EXPERIMENTAL_APP_LIST_DESCRIPTION,
1576      kOsWin | kOsLinux | kOsCrOS,
1577      ENABLE_DISABLE_VALUE_TYPE(
1578          app_list::switches::kEnableExperimentalAppList,
1579          app_list::switches::kDisableExperimentalAppList)},
1580     {"enable-centered-app-list",
1581      IDS_FLAGS_ENABLE_CENTERED_APP_LIST_NAME,
1582      IDS_FLAGS_ENABLE_CENTERED_APP_LIST_DESCRIPTION,
1583      kOsWin | kOsLinux | kOsCrOS,
1584      SINGLE_VALUE_TYPE(app_list::switches::kEnableCenteredAppList)},
1585     {"enable-new-app-list-mixer",
1586      IDS_FLAGS_ENABLE_NEW_APP_LIST_MIXER_NAME,
1587      IDS_FLAGS_ENABLE_NEW_APP_LIST_MIXER_DESCRIPTION,
1588      kOsWin | kOsLinux | kOsCrOS | kOsMac,
1589      ENABLE_DISABLE_VALUE_TYPE(app_list::switches::kEnableNewAppListMixer,
1590                                app_list::switches::kDisableNewAppListMixer)},
1591 #endif
1592     {"disable-threaded-scrolling",
1593      IDS_FLAGS_DISABLE_THREADED_SCROLLING_NAME,
1594      IDS_FLAGS_DISABLE_THREADED_SCROLLING_DESCRIPTION,
1595      kOsWin | kOsLinux | kOsCrOS | kOsAndroid | kOsMac,
1596      SINGLE_VALUE_TYPE(switches::kDisableThreadedScrolling)},
1597     {"invert-viewport-scroll-order",
1598      IDS_FLAGS_INVERT_VIEWPORT_SCROLL_ORDER_NAME,
1599      IDS_FLAGS_INVERT_VIEWPORT_SCROLL_ORDER_DESCRIPTION,
1600      kOsAll,
1601      SINGLE_VALUE_TYPE(switches::kInvertViewportScrollOrder)},
1602     {"bleeding-edge-renderer-mode",
1603      IDS_FLAGS_BLEEDING_RENDERER_NAME,
1604      IDS_FLAGS_BLEEDING_RENDERER_DESCRIPTION,
1605      kOsAndroid,
1606      SINGLE_VALUE_TYPE(switches::kEnableBleedingEdgeRenderingFastPaths)},
1607     {"enable-settings-window",
1608      IDS_FLAGS_ENABLE_SETTINGS_WINDOW_NAME,
1609      IDS_FLAGS_ENABLE_SETTINGS_WINDOW_DESCRIPTION,
1610      kOsDesktop,
1611      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSettingsWindow,
1612                                switches::kDisableSettingsWindow)},
1613     {"enable-save-password-bubble",
1614      IDS_FLAGS_ENABLE_SAVE_PASSWORD_BUBBLE_NAME,
1615      IDS_FLAGS_ENABLE_SAVE_PASSWORD_BUBBLE_DESCRIPTION,
1616      kOsWin | kOsLinux | kOsCrOS | kOsMac,
1617      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSavePasswordBubble,
1618                                switches::kDisableSavePasswordBubble)},
1619     {"enable-apps-file-associations",
1620      IDS_FLAGS_ENABLE_APPS_FILE_ASSOCIATIONS_NAME,
1621      IDS_FLAGS_ENABLE_APPS_FILE_ASSOCIATIONS_DESCRIPTION,
1622      kOsMac,
1623      SINGLE_VALUE_TYPE(switches::kEnableAppsFileAssociations)},
1624 #if defined(OS_ANDROID)
1625     {"enable-embeddedsearch-api",
1626      IDS_FLAGS_ENABLE_EMBEDDEDSEARCH_API_NAME,
1627      IDS_FLAGS_ENABLE_EMBEDDEDSEARCH_API_DESCRIPTION,
1628      kOsAndroid,
1629      SINGLE_VALUE_TYPE(switches::kEnableEmbeddedSearchAPI)},
1630 #endif
1631     {"distance-field-text",
1632      IDS_FLAGS_DISTANCE_FIELD_TEXT_NAME,
1633      IDS_FLAGS_DISTANCE_FIELD_TEXT_DESCRIPTION,
1634      kOsAll,
1635      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableDistanceFieldText,
1636                                switches::kDisableDistanceFieldText)},
1637     {"extension-content-verification",
1638      IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_NAME,
1639      IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_DESCRIPTION,
1640      kOsDesktop,
1641      MULTI_VALUE_TYPE(kExtensionContentVerificationChoices)},
1642 #if defined(ENABLE_EXTENSIONS)
1643     {"extension-active-script-permission",
1644      IDS_FLAGS_USER_CONSENT_FOR_EXTENSION_SCRIPTS_NAME,
1645      IDS_FLAGS_USER_CONSENT_FOR_EXTENSION_SCRIPTS_DESCRIPTION,
1646      kOsAll,
1647      SINGLE_VALUE_TYPE(extensions::switches::kEnableScriptsRequireAction)},
1648 #endif
1649 #if defined(OS_ANDROID)
1650     {"enable-data-reduction-proxy-dev",
1651      IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_DEV_NAME,
1652      IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_DEV_DESCRIPTION,
1653      kOsAndroid,
1654      ENABLE_DISABLE_VALUE_TYPE(
1655          data_reduction_proxy::switches::kEnableDataReductionProxyDev,
1656          data_reduction_proxy::switches::kDisableDataReductionProxyDev)},
1657     {"enable-data-reduction-proxy-carrier-test",
1658      IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_CARRIER_TEST_NAME,
1659      IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_CARRIER_TEST_DESCRIPTION,
1660      kOsAndroid,
1661      SINGLE_VALUE_TYPE(
1662          data_reduction_proxy::switches::kEnableDataReductionProxyCarrierTest)},
1663 #endif
1664     {"enable-hotword-hardware",
1665      IDS_FLAGS_ENABLE_EXPERIMENTAL_HOTWORD_HARDWARE_NAME,
1666      IDS_FLAGS_ENABLE_EXPERIMENTAL_HOTWORD_HARDWARE_DESCRIPTION,
1667      kOsCrOS,
1668      SINGLE_VALUE_TYPE(switches::kEnableExperimentalHotwordHardware)},
1669 #if defined(ENABLE_EXTENSIONS)
1670     {"enable-embedded-extension-options",
1671      IDS_FLAGS_ENABLE_EMBEDDED_EXTENSION_OPTIONS_NAME,
1672      IDS_FLAGS_ENABLE_EMBEDDED_EXTENSION_OPTIONS_DESCRIPTION,
1673      kOsDesktop,
1674      SINGLE_VALUE_TYPE(extensions::switches::kEnableEmbeddedExtensionOptions)},
1675 #endif
1676 #if defined(USE_ASH)
1677     {"enable-web-app-frame",
1678      IDS_FLAGS_ENABLE_WEB_APP_FRAME_NAME,
1679      IDS_FLAGS_ENABLE_WEB_APP_FRAME_DESCRIPTION,
1680      kOsWin | kOsCrOS,
1681      SINGLE_VALUE_TYPE(switches::kEnableWebAppFrame)},
1682 #endif
1683     {"enable-drop-sync-credential",
1684      IDS_FLAGS_ENABLE_DROP_SYNC_CREDENTIAL_NAME,
1685      IDS_FLAGS_ENABLE_DROP_SYNC_CREDENTIAL_DESCRIPTION,
1686      kOsAll,
1687      ENABLE_DISABLE_VALUE_TYPE(
1688          password_manager::switches::kEnableDropSyncCredential,
1689          password_manager::switches::kDisableDropSyncCredential)},
1690 #if defined(ENABLE_EXTENSIONS)
1691     {"enable-extension-action-redesign",
1692      IDS_FLAGS_ENABLE_EXTENSION_ACTION_REDESIGN_NAME,
1693      IDS_FLAGS_ENABLE_EXTENSION_ACTION_REDESIGN_DESCRIPTION,
1694      kOsDesktop,
1695      SINGLE_VALUE_TYPE(extensions::switches::kEnableExtensionActionRedesign)},
1696 #endif
1697     {"autofill-sync-credential",
1698      IDS_FLAGS_AUTOFILL_SYNC_CREDENTIAL_NAME,
1699      IDS_FLAGS_AUTOFILL_SYNC_CREDENTIAL_DESCRIPTION,
1700      kOsAll,
1701      MULTI_VALUE_TYPE(kAutofillSyncCredentialChoices)},
1702 #if !defined(OS_ANDROID)
1703     {"enable-message-center-always-scroll-up-upon-notification-removal",
1704      IDS_FLAGS_ENABLE_MESSAGE_CENTER_ALWAYS_SCROLL_UP_UPON_REMOVAL_NAME,
1705      IDS_FLAGS_ENABLE_MESSAGE_CENTER_ALWAYS_SCROLL_UP_UPON_REMOVAL_DESCRIPTION,
1706      kOsDesktop,
1707      SINGLE_VALUE_TYPE(
1708          switches::kEnableMessageCenterAlwaysScrollUpUponNotificationRemoval)},
1709 #endif
1710 #if !defined(OS_ANDROID) && !defined(OS_IOS)
1711     {"enable-md-settings",
1712      IDS_FLAGS_ENABLE_MATERIAL_DESIGN_SETTINGS_NAME,
1713      IDS_FLAGS_ENABLE_MATERIAL_DESIGN_SETTINGS_DESCRIPTION,
1714      kOsDesktop,
1715      SINGLE_VALUE_TYPE(switches::kEnableMaterialDesignSettings)},
1716 #endif
1717 #if defined(OS_CHROMEOS)
1718     {"memory-pressure-thresholds",
1719      IDS_FLAGS_MEMORY_PRESSURE_THRESHOLD_NAME,
1720      IDS_FLAGS_MEMORY_PRESSURE_THRESHOLD_DESCRIPTION,
1721      kOsCrOS,
1722      MULTI_VALUE_TYPE(kMemoryPressureThresholdChoices)},
1723     {"wake-on-packets",
1724      IDS_FLAGS_WAKE_ON_PACKETS_NAME,
1725      IDS_FLAGS_WAKE_ON_PACKETS_DESCRIPTION,
1726      kOsCrOSOwnerOnly,
1727      SINGLE_VALUE_TYPE(chromeos::switches::kWakeOnPackets)},
1728 #endif  // OS_CHROMEOS
1729     {"enable-tab-audio-muting",
1730      IDS_FLAGS_ENABLE_TAB_AUDIO_MUTING_NAME,
1731      IDS_FLAGS_ENABLE_TAB_AUDIO_MUTING_DESCRIPTION,
1732      kOsDesktop,
1733      SINGLE_VALUE_TYPE(switches::kEnableTabAudioMuting)},
1734     {"enable-credential-manager-api",
1735      IDS_FLAGS_CREDENTIAL_MANAGER_API_NAME,
1736      IDS_FLAGS_CREDENTIAL_MANAGER_API_DESCRIPTION,
1737      kOsAll,
1738      SINGLE_VALUE_TYPE(switches::kEnableCredentialManagerAPI)},
1739     {"reduced-referrer-granularity",
1740      IDS_FLAGS_REDUCED_REFERRER_GRANULARITY_NAME,
1741      IDS_FLAGS_REDUCED_REFERRER_GRANULARITY_DESCRIPTION,
1742      kOsAll,
1743      SINGLE_VALUE_TYPE(switches::kReducedReferrerGranularity)},
1744 #if defined(ENABLE_PLUGINS)
1745     {"enable-plugin-power-saver",
1746      IDS_FLAGS_ENABLE_PLUGIN_POWER_SAVER_NAME,
1747      IDS_FLAGS_ENABLE_PLUGIN_POWER_SAVER_DESCRIPTION,
1748      kOsDesktop,
1749      ENABLE_DISABLE_VALUE_TYPE(plugins::switches::kEnablePluginPowerSaver,
1750                                plugins::switches::kDisablePluginPowerSaver)},
1751 #endif
1752 #if defined(OS_CHROMEOS)
1753     {"disable-new-zip-unpacker",
1754      IDS_FLAGS_DISABLE_NEW_ZIP_UNPACKER_NAME,
1755      IDS_FLAGS_DISABLE_NEW_ZIP_UNPACKER_DESCRIPTION,
1756      kOsCrOS,
1757      SINGLE_VALUE_TYPE(chromeos::switches::kDisableNewZIPUnpacker)},
1758 #endif  // defined(OS_CHROMEOS)
1759     {"enable-credit-card-scan",
1760      IDS_FLAGS_ENABLE_CREDIT_CARD_SCAN_NAME,
1761      IDS_FLAGS_ENABLE_CREDIT_CARD_SCAN_DESCRIPTION,
1762      kOsAndroid,
1763      ENABLE_DISABLE_VALUE_TYPE(autofill::switches::kEnableCreditCardScan,
1764                                autofill::switches::kDisableCreditCardScan)},
1765 #if defined(OS_CHROMEOS)
1766     {"disable-captive-portal-bypass-proxy",
1767      IDS_FLAGS_DISABLE_CAPTIVE_PORTAL_BYPASS_PROXY_NAME,
1768      IDS_FLAGS_DISABLE_CAPTIVE_PORTAL_BYPASS_PROXY_DESCRIPTION,
1769      kOsCrOS,
1770      SINGLE_VALUE_TYPE(chromeos::switches::kDisableCaptivePortalBypassProxy)},
1771 #endif  // defined(OS_CHROMEOS)
1772 #if defined(OS_ANDROID)
1773     {"enable-seccomp-filter-sandbox",
1774      IDS_FLAGS_ENABLE_SECCOMP_FILTER_SANDBOX_ANDROID_NAME,
1775      IDS_FLAGS_ENABLE_SECCOMP_FILTER_SANDBOX_ANDROID_DESCRIPTION,
1776      kOsAndroid,
1777      SINGLE_VALUE_TYPE(switches::kEnableSeccompFilterSandbox)},
1778 #endif
1779     {"enable-touch-hover",
1780      IDS_FLAGS_ENABLE_TOUCH_HOVER_NAME,
1781      IDS_FLAGS_ENABLE_TOUCH_HOVER_DESCRIPTION,
1782      kOsAndroid,
1783      SINGLE_VALUE_TYPE("enable-touch-hover")},
1784     {"enable-fill-on-account-select",
1785      IDS_FILL_ON_ACCOUNT_SELECT_NAME,
1786      IDS_FILL_ON_ACCOUNT_SELECT_DESCRIPTION,
1787      kOsAll,
1788      MULTI_VALUE_TYPE(kFillOnAccountSelectChoices)},
1789 #if defined(OS_CHROMEOS)
1790     {"enable-wifi-credential-sync",  // FLAGS:RECORD_UMA
1791      IDS_FLAGS_ENABLE_WIFI_CREDENTIAL_SYNC_NAME,
1792      IDS_FLAGS_ENABLE_WIFI_CREDENTIAL_SYNC_DESCRIPTION,
1793      kOsCrOS,
1794      SINGLE_VALUE_TYPE(switches::kEnableWifiCredentialSync)},
1795     {"enable-potentially-annoying-security-features",
1796      IDS_FLAGS_EXPERIMENTAL_SECURITY_FEATURES_NAME,
1797      IDS_FLAGS_EXPERIMENTAL_SECURITY_FEATURES_DESCRIPTION,
1798      kOsAll,
1799      SINGLE_VALUE_TYPE(switches::kEnablePotentiallyAnnoyingSecurityFeatures)},
1800 #endif
1801     {"disable-delay-agnostic-aec",
1802      IDS_FLAGS_DISABLE_DELAY_AGNOSTIC_AEC_NAME,
1803      IDS_FLAGS_DISABLE_DELAY_AGNOSTIC_AEC_DESCRIPTION,
1804      kOsWin | kOsLinux | kOsCrOS,
1805      SINGLE_VALUE_TYPE(switches::kDisableDelayAgnosticAec)},
1806     {"enable-delay-agnostic-aec",
1807      IDS_FLAGS_ENABLE_DELAY_AGNOSTIC_AEC_NAME,
1808      IDS_FLAGS_ENABLE_DELAY_AGNOSTIC_AEC_DESCRIPTION,
1809      kOsMac,
1810      SINGLE_VALUE_TYPE(switches::kEnableDelayAgnosticAec)},
1811     {"mark-non-secure-as",  // FLAGS:RECORD_UMA
1812      IDS_MARK_NON_SECURE_AS_NAME,
1813      IDS_MARK_NON_SECURE_AS_DESCRIPTION,
1814      kOsAll,
1815      MULTI_VALUE_TYPE(kMarkNonSecureAsChoices)},
1816     {"enable-site-per-process",
1817      IDS_FLAGS_ENABLE_SITE_PER_PROCESS_NAME,
1818      IDS_FLAGS_ENABLE_SITE_PER_PROCESS_DESCRIPTION,
1819      kOsAll,
1820      SINGLE_VALUE_TYPE(switches::kSitePerProcess)},
1821 #if defined(OS_MACOSX)
1822     {"enable-harfbuzz-rendertext",
1823      IDS_FLAGS_ENABLE_HARFBUZZ_RENDERTEXT_NAME,
1824      IDS_FLAGS_ENABLE_HARFBUZZ_RENDERTEXT_DESCRIPTION,
1825      kOsMac,
1826      SINGLE_VALUE_TYPE(switches::kEnableHarfBuzzRenderText)},
1827 #endif  // defined(OS_MACOSX)
1828 #if defined(OS_CHROMEOS)
1829     {"disable-timezone-tracking",
1830      IDS_FLAGS_DISABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_NAME,
1831      IDS_FLAGS_DISABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_DESCRIPTION,
1832      kOsCrOS,
1833      SINGLE_VALUE_TYPE(chromeos::switches::kDisableTimeZoneTrackingOption)},
1834 #endif  // defined(OS_CHROMEOS)
1835     {"data-reduction-proxy-lo-fi",
1836      IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_NAME,
1837      IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_DESCRIPTION,
1838      kOsAll,
1839      MULTI_VALUE_TYPE(kDataReductionProxyLoFiChoices)},
1840     {"clear-data-reduction-proxy-data-savings",
1841      IDS_FLAGS_DATA_REDUCTION_PROXY_RESET_SAVINGS_NAME,
1842      IDS_FLAGS_DATA_REDUCTION_PROXY_RESET_SAVINGS_DESCRIPTION,
1843      kOsAll,
1844      SINGLE_VALUE_TYPE(
1845          data_reduction_proxy::switches::kClearDataReductionProxyDataSavings)},
1846     {"enable-data-reduction-proxy-config-client",
1847      IDS_FLAGS_DATA_REDUCTION_PROXY_CONFIG_CLIENT_NAME,
1848      IDS_FLAGS_DATA_REDUCTION_PROXY_CONFIG_CLIENT_DESCRIPTION,
1849      kOsAll,
1850      SINGLE_VALUE_TYPE(data_reduction_proxy::switches::
1851                            kEnableDataReductionProxyConfigClient)},
1852 #if defined(ENABLE_DATA_REDUCTION_PROXY_DEBUGGING)
1853     {"enable-data-reduction-proxy-bypass-warnings",
1854      IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_BYPASS_WARNING_NAME,
1855      IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_BYPASS_WARNING_DESCRIPTION,
1856      kOsAndroid,
1857      SINGLE_VALUE_TYPE(data_reduction_proxy::switches::
1858                            kEnableDataReductionProxyBypassWarning)},
1859 #endif
1860     {"allow-insecure-localhost",
1861      IDS_ALLOW_INSECURE_LOCALHOST,
1862      IDS_ALLOW_INSECURE_LOCALHOST_DESCRIPTION,
1863      kOsAll,
1864      SINGLE_VALUE_TYPE(switches::kAllowInsecureLocalhost)},
1865     {"enable-add-to-shelf",
1866      IDS_FLAGS_ENABLE_ADD_TO_SHELF_NAME,
1867      IDS_FLAGS_ENABLE_ADD_TO_SHELF_DESCRIPTION,
1868      kOsDesktop,
1869      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAddToShelf,
1870                                switches::kDisableAddToShelf)},
1871     {"bypass-app-banner-engagement-checks",
1872      IDS_FLAGS_BYPASS_APP_BANNER_ENGAGEMENT_CHECKS_NAME,
1873      IDS_FLAGS_BYPASS_APP_BANNER_ENGAGEMENT_CHECKS_DESCRIPTION,
1874      kOsAll,
1875      SINGLE_VALUE_TYPE(switches::kBypassAppBannerEngagementChecks)},
1876     {"use-sync-sandbox",
1877      IDS_FLAGS_SYNC_SANDBOX_NAME,
1878      IDS_FLAGS_SYNC_SANDBOX_DESCRIPTION,
1879      kOsAll,
1880      SINGLE_VALUE_TYPE_AND_VALUE(
1881          switches::kSyncServiceURL,
1882          "https://chrome-sync.sandbox.google.com/chrome-sync/alpha")},
1883     {"enable-child-account-detection",
1884      IDS_FLAGS_CHILD_ACCOUNT_DETECTION_NAME,
1885      IDS_FLAGS_CHILD_ACCOUNT_DETECTION_DESCRIPTION,
1886      kOsAndroid | kOsMac | kOsWin | kOsLinux | kOsCrOS,
1887      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableChildAccountDetection,
1888                                switches::kDisableChildAccountDetection)},
1889 #if defined(OS_CHROMEOS) && defined(USE_OZONE)
1890     {"ozone-test-single-overlay-support",
1891      IDS_FLAGS_OZONE_TEST_SINGLE_HARDWARE_OVERLAY,
1892      IDS_FLAGS_OZONE_TEST_SINGLE_HARDWARE_OVERLAY_DESCRIPTION,
1893      kOsCrOS,
1894      SINGLE_VALUE_TYPE(switches::kOzoneTestSingleOverlaySupport)},
1895 #endif  // defined(OS_CHROMEOS) && defined(USE_OZONE)
1896     {"v8-pac-mojo-out-of-process",
1897      IDS_FLAGS_V8_PAC_MOJO_OUT_OF_PROCESS_NAME,
1898      IDS_FLAGS_V8_PAC_MOJO_OUT_OF_PROCESS_DESCRIPTION,
1899      kOsDesktop,
1900      ENABLE_DISABLE_VALUE_TYPE(switches::kV8PacMojoOutOfProcess,
1901                                switches::kDisableOutOfProcessPac)},
1902 #if defined(ENABLE_MEDIA_ROUTER)
1903     {"enable-media-router",
1904      IDS_FLAGS_ENABLE_MEDIA_ROUTER_NAME,
1905      IDS_FLAGS_ENABLE_MEDIA_ROUTER_DESCRIPTION,
1906      kOsAll,
1907      SINGLE_VALUE_TYPE(switches::kEnableMediaRouter)},
1908 #endif  // defined(ENABLE_MEDIA_ROUTER)
1909 // Since Drive Search is not available when app list is disabled, flag guard
1910 // enable-drive-search-in-chrome-launcher flag.
1911 #if defined(ENABLE_APP_LIST)
1912     {"enable-drive-search-in-app-launcher",
1913      IDS_FLAGS_ENABLE_DRIVE_SEARCH_IN_CHROME_LAUNCHER,
1914      IDS_FLAGS_ENABLE_DRIVE_SEARCH_IN_CHROME_LAUNCHER_DESCRIPTION,
1915      kOsCrOS,
1916      ENABLE_DISABLE_VALUE_TYPE(
1917          app_list::switches::kEnableDriveSearchInChromeLauncher,
1918          app_list::switches::kDisableDriveSearchInChromeLauncher)},
1919 #endif  // defined(ENABLE_APP_LIST)
1920 #if defined(OS_CHROMEOS)
1921     {"disable-mtp-write-support",
1922      IDS_FLAG_DISABLE_MTP_WRITE_SUPPORT_NAME,
1923      IDS_FLAG_DISABLE_MTP_WRITE_SUPPORT_DESCRIPTION,
1924      kOsCrOS,
1925      SINGLE_VALUE_TYPE(chromeos::switches::kDisableMtpWriteSupport)},
1926 #endif  // defined(OS_CHROMEOS)
1927 #if defined(OS_CHROMEOS)
1928     {"enable-datasaver-prompt",
1929      IDS_FLAGS_DATASAVER_PROMPT_NAME,
1930      IDS_FLAGS_DATASAVER_PROMPT_DESCRIPTION,
1931      kOsCrOS,
1932      MULTI_VALUE_TYPE(kDataSaverPromptChoices)},
1933 #endif  // defined(OS_CHROMEOS)
1934     {"supervised-user-safesites",
1935      IDS_FLAGS_SUPERVISED_USER_SAFESITES_NAME,
1936      IDS_FLAGS_SUPERVISED_USER_SAFESITES_DESCRIPTION,
1937      kOsAndroid | kOsMac | kOsWin | kOsLinux | kOsCrOS,
1938      MULTI_VALUE_TYPE(kSupervisedUserSafeSitesChoices)},
1939 #if defined(OS_ANDROID)
1940     {"enable-autofill-keyboard-accessory-view",
1941      IDS_FLAGS_AUTOFILL_ACCESSORY_VIEW_NAME,
1942      IDS_FLAGS_AUTOFILL_ACCESSORY_VIEW_DESCRIPTION,
1943      kOsAndroid,
1944      ENABLE_DISABLE_VALUE_TYPE(
1945          autofill::switches::kEnableAccessorySuggestionView,
1946          autofill::switches::kDisableAccessorySuggestionView)},
1947 #endif  // defined(OS_ANDROID)
1948     {"disable-new-video-renderer",
1949      IDS_FLAGS_DISABLE_NEW_VIDEO_RENDERER_NAME,
1950      IDS_FLAGS_DISABLE_NEW_VIDEO_RENDERER_DESCRIPTION,
1951      kOsAll,
1952      SINGLE_VALUE_TYPE(switches::kDisableNewVideoRenderer)},
1953     // Temporary flag to ease the transition to standard-compliant scrollTop
1954     // behavior.  Will be removed shortly after http://crbug.com/157855 ships.
1955     {"scroll-top-left-interop",
1956      IDS_FLAGS_SCROLL_TOP_LEFT_INTEROP_NAME,
1957      IDS_FLAGS_SCROLL_TOP_LEFT_INTEROP_DESCRIPTION,
1958      kOsAll,
1959      ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(switches::kEnableBlinkFeatures,
1960                                          "ScrollTopLeftInterop",
1961                                          switches::kDisableBlinkFeatures,
1962                                          "ScrollTopLeftInterop")},
1963 #if defined(OS_WIN)
1964     {"try-supported-channel-layouts",
1965      IDS_FLAGS_TRY_SUPPORTED_CHANNEL_LAYOUTS_NAME,
1966      IDS_FLAGS_TRY_SUPPORTED_CHANNEL_LAYOUTS_DESCRIPTION,
1967      kOsWin,
1968      SINGLE_VALUE_TYPE(switches::kTrySupportedChannelLayouts)},
1969 #endif
1970     {"emphasize-titles-in-omnibox-dropdown",
1971      IDS_FLAGS_EMPHASIZE_TITLES_IN_OMNIBOX_DROPDOWN_NAME,
1972      IDS_FLAGS_EMPHASIZE_TITLES_IN_OMNIBOX_DROPDOWN_DESCRIPTION,
1973      kOsAll,
1974      SINGLE_VALUE_TYPE(switches::kEmphasizeTitlesInOmniboxDropdown)},
1975 #if defined(ENABLE_WEBRTC)
1976     {"enable-webrtc-dtls12",
1977      IDS_FLAGS_ENABLE_WEBRTC_DTLS12_NAME,
1978      IDS_FLAGS_ENABLE_WEBRTC_DTLS12_DESCRIPTION,
1979      kOsAll,
1980      SINGLE_VALUE_TYPE(switches::kEnableWebRtcDtls12)},
1981 #endif
1982 #if defined(OS_MACOSX)
1983     {"app-info-dialog",
1984      IDS_FLAGS_APP_INFO_DIALOG_NAME,
1985      IDS_FLAGS_APP_INFO_DIALOG_DESCRIPTION,
1986      kOsMac,
1987      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAppInfoDialogMac,
1988                                switches::kDisableAppInfoDialogMac)},
1989     {"mac-views-native-app-windows",
1990      IDS_FLAGS_MAC_VIEWS_NATIVE_APP_WINDOWS_NAME,
1991      IDS_FLAGS_MAC_VIEWS_NATIVE_APP_WINDOWS_DESCRIPTION,
1992      kOsMac,
1993      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableMacViewsNativeAppWindows,
1994                                switches::kDisableMacViewsNativeAppWindows)},
1995     {"app-window-cycling",
1996      IDS_FLAGS_APP_WINDOW_CYCLING_NAME,
1997      IDS_FLAGS_APP_WINDOW_CYCLING_DESCRIPTION,
1998      kOsMac,
1999      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAppWindowCycling,
2000                                switches::kDisableAppWindowCycling)},
2001     {"mac-views-dialogs",
2002      IDS_FLAGS_MAC_VIEWS_DIALOGS_NAME,
2003      IDS_FLAGS_MAC_VIEWS_DIALOGS_DESCRIPTION,
2004      kOsMac,
2005      SINGLE_VALUE_TYPE(switches::kEnableMacViewsDialogs)},
2006 #endif
2007 #if defined(ENABLE_WEBVR)
2008     {"enable-webvr",
2009      IDS_FLAGS_ENABLE_WEBVR_NAME,
2010      IDS_FLAGS_ENABLE_WEBVR_DESCRIPTION,
2011      kOsAll,
2012      SINGLE_VALUE_TYPE(switches::kEnableWebVR)},
2013 #endif
2014 #if defined(OS_CHROMEOS)
2015     {"disable-accelerated-mjpeg-decode",
2016      IDS_FLAGS_DISABLE_ACCELERATED_MJPEG_DECODE_NAME,
2017      IDS_FLAGS_DISABLE_ACCELERATED_MJPEG_DECODE_DESCRIPTION,
2018      kOsCrOS,
2019      SINGLE_VALUE_TYPE(switches::kDisableAcceleratedMjpegDecode)},
2020 #endif  // OS_CHROMEOS
2021     {"v8-cache-options",
2022      IDS_FLAGS_V8_CACHE_OPTIONS_NAME,
2023      IDS_FLAGS_V8_CACHE_OPTIONS_DESCRIPTION,
2024      kOsAll,
2025      MULTI_VALUE_TYPE(kV8CacheOptionsChoices)},
2026 #if !defined(OS_ANDROID) && !defined(OS_IOS)
2027     {"enable-md-downloads",
2028      IDS_FLAGS_ENABLE_MATERIAL_DESIGN_DOWNLOADS_NAME,
2029      IDS_FLAGS_ENABLE_MATERIAL_DESIGN_DOWNLOADS_DESCRIPTION,
2030      kOsDesktop,
2031      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableMaterialDesignDownloads,
2032                                switches::kDisableMaterialDesignDownloads)},
2033 #endif
2034 #if defined(OS_WIN) || defined(OS_MACOSX)
2035     {"enable-tab-discarding",
2036      IDS_FLAGS_ENABLE_TAB_DISCARDING_NAME,
2037      IDS_FLAGS_ENABLE_TAB_DISCARDING_DESCRIPTION,
2038      kOsWin | kOsMac,
2039      SINGLE_VALUE_TYPE(switches::kEnableTabDiscarding)},
2040 #endif
2041     {"enable-clear-browsing-data-counters",
2042      IDS_FLAGS_ENABLE_CLEAR_BROWSING_DATA_COUNTERS_NAME,
2043      IDS_FLAGS_ENABLE_CLEAR_BROWSING_DATA_COUNTERS_DESCRIPTION,
2044      kOsAll,
2045      SINGLE_VALUE_TYPE(switches::kEnableClearBrowsingDataCounters)
2046     },
2047 #if defined(ENABLE_TASK_MANAGER)
2048     {"disable-new-task-manager",
2049      IDS_FLAGS_DISABLE_NEW_TASK_MANAGER_NAME,
2050      IDS_FLAGS_DISABLE_NEW_TASK_MANAGER_DESCRIPTION,
2051      kOsDesktop,
2052      SINGLE_VALUE_TYPE(switches::kDisableNewTaskManager)
2053     },
2054 #endif  // defined(ENABLE_TASK_MANAGER)
2055     {"simplified-fullscreen-ui",
2056      IDS_FLAGS_SIMPLIFIED_FULLSCREEN_UI_NAME,
2057      IDS_FLAGS_SIMPLIFIED_FULLSCREEN_UI_DESCRIPTION,
2058      kOsDesktop,
2059      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSimplifiedFullscreenUI,
2060                                switches::kDisableSimplifiedFullscreenUI)
2061     },
2062 #if defined(OS_ANDROID)
2063     {"progress-bar-animation",
2064      IDS_FLAGS_PROGRESS_BAR_ANIMATION_NAME,
2065      IDS_FLAGS_PROGRESS_BAR_ANIMATION_DESCRIPTION,
2066      kOsAndroid,
2067      MULTI_VALUE_TYPE(kProgressBarAnimationChoices)},
2068 #endif  // defined(OS_ANDROID)
2069 #if defined(OS_ANDROID)
2070     {"offline-pages",
2071      IDS_FLAGS_OFFLINE_PAGES_NAME,
2072      IDS_FLAGS_OFFLINE_PAGES_DESCRIPTION,
2073      kOsAndroid,
2074      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableOfflinePages,
2075                                switches::kDisableOfflinePages)},
2076 #endif  // defined(OS_ANDROID)
2077     {"low-priority-iframes",
2078      IDS_FLAGS_LOW_PRIORITY_IFRAMES_UI_NAME,
2079      IDS_FLAGS_LOW_PRIORITY_IFRAMES_UI_DESCRIPTION,
2080      kOsAll,
2081      // NOTE: if we want to add additional experiment entries for other
2082      // features controlled by kBlinkSettings, we'll need to add logic to
2083      // merge the flag values.
2084      SINGLE_VALUE_TYPE_AND_VALUE(
2085          switches::kBlinkSettings, "lowPriorityIframes=true")},
2086 #if defined(OS_ANDROID)
2087     {"enable-ntp-popular-sites",
2088      IDS_FLAGS_NTP_POPULAR_SITES_NAME,
2089      IDS_FLAGS_NTP_POPULAR_SITES_DESCRIPTION,
2090      kOsAndroid,
2091      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableNTPPopularSites,
2092                                switches::kDisableNTPPopularSites)},
2093 #endif  // defined(OS_ANDROID)
2094 #if defined(OS_WIN)
2095      {"trace-export-events-to-etw",
2096       IDS_FLAGS_TRACE_EXPORT_EVENTS_TO_ETW_NAME,
2097       IDS_FLAGS_TRACE_EXPORT_EVENTS_TO_ETW_DESRIPTION,
2098       kOsWin,
2099       SINGLE_VALUE_TYPE(switches::kTraceExportEventsToETW)},
2100 #endif  // defined(OS_WIN)
2101     // NOTE: Adding new command-line switches requires adding corresponding
2102     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
2103     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.
2104 };
2105
2106 const Experiment* experiments = kExperiments;
2107 size_t num_experiments = arraysize(kExperiments);
2108
2109 // Stores and encapsulates the little state that about:flags has.
2110 class FlagsState {
2111  public:
2112   FlagsState() : needs_restart_(false) {}
2113   void ConvertFlagsToSwitches(FlagsStorage* flags_storage,
2114                               base::CommandLine* command_line,
2115                               SentinelsMode sentinels);
2116   bool IsRestartNeededToCommitChanges();
2117   void SetExperimentEnabled(
2118       FlagsStorage* flags_storage,
2119       const std::string& internal_name,
2120       bool enable);
2121   void RemoveFlagsSwitches(
2122       std::map<std::string, base::CommandLine::StringType>* switch_list);
2123   void ResetAllFlags(FlagsStorage* flags_storage);
2124   void reset();
2125
2126   // Returns the singleton instance of this class
2127   static FlagsState* GetInstance() {
2128     return Singleton<FlagsState>::get();
2129   }
2130
2131  private:
2132   bool needs_restart_;
2133   std::map<std::string, std::string> flags_switches_;
2134
2135   DISALLOW_COPY_AND_ASSIGN(FlagsState);
2136 };
2137
2138 // Adds the internal names for the specified experiment to |names|.
2139 void AddInternalName(const Experiment& e, std::set<std::string>* names) {
2140   if (e.type == Experiment::SINGLE_VALUE ||
2141       e.type == Experiment::SINGLE_DISABLE_VALUE) {
2142     names->insert(e.internal_name);
2143   } else {
2144     DCHECK(e.type == Experiment::MULTI_VALUE ||
2145            e.type == Experiment::ENABLE_DISABLE_VALUE);
2146     for (int i = 0; i < e.num_choices; ++i)
2147       names->insert(e.NameForChoice(i));
2148   }
2149 }
2150
2151 // Confirms that an experiment is valid, used in a DCHECK in
2152 // SanitizeList below.
2153 bool ValidateExperiment(const Experiment& e) {
2154   switch (e.type) {
2155     case Experiment::SINGLE_VALUE:
2156     case Experiment::SINGLE_DISABLE_VALUE:
2157       DCHECK_EQ(0, e.num_choices);
2158       DCHECK(!e.choices);
2159       break;
2160     case Experiment::MULTI_VALUE:
2161       DCHECK_GT(e.num_choices, 0);
2162       DCHECK(e.choices);
2163       DCHECK(e.choices[0].command_line_switch);
2164       DCHECK_EQ('\0', e.choices[0].command_line_switch[0]);
2165       break;
2166     case Experiment::ENABLE_DISABLE_VALUE:
2167       DCHECK_EQ(3, e.num_choices);
2168       DCHECK(!e.choices);
2169       DCHECK(e.command_line_switch);
2170       DCHECK(e.command_line_value);
2171       DCHECK(e.disable_command_line_switch);
2172       DCHECK(e.disable_command_line_value);
2173       break;
2174     default:
2175       NOTREACHED();
2176   }
2177   return true;
2178 }
2179
2180 // Removes all experiments from prefs::kEnabledLabsExperiments that are
2181 // unknown, to prevent this list to become very long as experiments are added
2182 // and removed.
2183 void SanitizeList(FlagsStorage* flags_storage) {
2184   std::set<std::string> known_experiments;
2185   for (size_t i = 0; i < num_experiments; ++i) {
2186     DCHECK(ValidateExperiment(experiments[i]));
2187     AddInternalName(experiments[i], &known_experiments);
2188   }
2189
2190   std::set<std::string> enabled_experiments = flags_storage->GetFlags();
2191
2192   std::set<std::string> new_enabled_experiments =
2193       base::STLSetIntersection<std::set<std::string> >(
2194           known_experiments, enabled_experiments);
2195
2196   if (new_enabled_experiments != enabled_experiments)
2197     flags_storage->SetFlags(new_enabled_experiments);
2198 }
2199
2200 void GetSanitizedEnabledFlags(
2201     FlagsStorage* flags_storage, std::set<std::string>* result) {
2202   SanitizeList(flags_storage);
2203   *result = flags_storage->GetFlags();
2204 }
2205
2206 bool SkipConditionalExperiment(const Experiment& experiment) {
2207   version_info::Channel channel = chrome::GetChannel();
2208
2209 #if defined(OS_ANDROID)
2210   // enable-data-reduction-proxy-dev is only available for the Dev/Beta channel.
2211   if (!strcmp("enable-data-reduction-proxy-dev", experiment.internal_name) &&
2212       channel != version_info::Channel::BETA &&
2213       channel != version_info::Channel::DEV) {
2214     return true;
2215   }
2216   // enable-data-reduction-proxy-alt is only available for the Dev channel.
2217   if (!strcmp("enable-data-reduction-proxy-alt", experiment.internal_name) &&
2218       channel != version_info::Channel::DEV) {
2219     return true;
2220   }
2221   // enable-data-reduction-proxy-carrier-test is only available for Chromium
2222   // builds and the Canary/Dev channel.
2223   if (!strcmp("enable-data-reduction-proxy-carrier-test",
2224               experiment.internal_name) &&
2225       channel != version_info::Channel::DEV &&
2226       channel != version_info::Channel::CANARY &&
2227       channel != version_info::Channel::UNKNOWN) {
2228     return true;
2229   }
2230 #endif
2231
2232   // data-reduction-proxy-lo-fi is only available for Chromium builds and
2233   // the Canary/Dev/Beta channels.
2234   if (!strcmp("data-reduction-proxy-lo-fi", experiment.internal_name) &&
2235       channel != version_info::Channel::BETA &&
2236       channel != version_info::Channel::DEV &&
2237       channel != version_info::Channel::CANARY &&
2238       channel != version_info::Channel::UNKNOWN) {
2239     return true;
2240   }
2241
2242   // enable-data-reduction-proxy-config-client is only available for Chromium
2243   // builds and the Canary/Dev channels.
2244   if (!strcmp("enable-data-reduction-proxy-config-client",
2245               experiment.internal_name) &&
2246       channel != version_info::Channel::DEV &&
2247       channel != version_info::Channel::CANARY &&
2248       channel != version_info::Channel::UNKNOWN) {
2249     return true;
2250   }
2251
2252 #if defined(ENABLE_DATA_REDUCTION_PROXY_DEBUGGING)
2253   // enable-data-reduction-proxy-bypass-warning is only available for Chromium
2254   // builds and Canary/Dev channel.
2255   if (!strcmp("enable-data-reduction-proxy-bypass-warnings",
2256               experiment.internal_name) &&
2257       channel != version_info::Channel::UNKNOWN &&
2258       channel != version_info::Channel::CANARY &&
2259       channel != version_info::Channel::DEV) {
2260     return true;
2261   }
2262 #endif
2263
2264   return false;
2265 }
2266
2267
2268 // Variant of GetSanitizedEnabledFlags that also removes any flags that aren't
2269 // enabled on the current platform.
2270 void GetSanitizedEnabledFlagsForCurrentPlatform(
2271     FlagsStorage* flags_storage, std::set<std::string>* result) {
2272   GetSanitizedEnabledFlags(flags_storage, result);
2273
2274   // Filter out any experiments that aren't enabled on the current platform.  We
2275   // don't remove these from prefs else syncing to a platform with a different
2276   // set of experiments would be lossy.
2277   std::set<std::string> platform_experiments;
2278   int current_platform = GetCurrentPlatform();
2279   for (size_t i = 0; i < num_experiments; ++i) {
2280     if (experiments[i].supported_platforms & current_platform)
2281       AddInternalName(experiments[i], &platform_experiments);
2282 #if defined(OS_CHROMEOS)
2283     if (experiments[i].supported_platforms & kOsCrOSOwnerOnly)
2284       AddInternalName(experiments[i], &platform_experiments);
2285 #endif
2286   }
2287
2288   std::set<std::string> new_enabled_experiments =
2289       base::STLSetIntersection<std::set<std::string> >(
2290           platform_experiments, *result);
2291
2292   result->swap(new_enabled_experiments);
2293 }
2294
2295 // Returns true if none of this experiment's options have been enabled.
2296 bool IsDefaultValue(
2297     const Experiment& experiment,
2298     const std::set<std::string>& enabled_experiments) {
2299   switch (experiment.type) {
2300     case Experiment::SINGLE_VALUE:
2301     case Experiment::SINGLE_DISABLE_VALUE:
2302       return enabled_experiments.count(experiment.internal_name) == 0;
2303     case Experiment::MULTI_VALUE:
2304     case Experiment::ENABLE_DISABLE_VALUE:
2305       for (int i = 0; i < experiment.num_choices; ++i) {
2306         if (enabled_experiments.count(experiment.NameForChoice(i)) > 0)
2307           return false;
2308       }
2309       break;
2310     default:
2311       NOTREACHED();
2312   }
2313   return true;
2314 }
2315
2316 // Returns the Value representing the choice data in the specified experiment.
2317 base::Value* CreateChoiceData(
2318     const Experiment& experiment,
2319     const std::set<std::string>& enabled_experiments) {
2320   DCHECK(experiment.type == Experiment::MULTI_VALUE ||
2321          experiment.type == Experiment::ENABLE_DISABLE_VALUE);
2322   base::ListValue* result = new base::ListValue;
2323   for (int i = 0; i < experiment.num_choices; ++i) {
2324     base::DictionaryValue* value = new base::DictionaryValue;
2325     const std::string name = experiment.NameForChoice(i);
2326     value->SetString("internal_name", name);
2327     value->SetString("description", experiment.DescriptionForChoice(i));
2328     value->SetBoolean("selected", enabled_experiments.count(name) > 0);
2329     result->Append(value);
2330   }
2331   return result;
2332 }
2333
2334 }  // namespace
2335
2336 std::string Experiment::NameForChoice(int index) const {
2337   DCHECK(type == Experiment::MULTI_VALUE ||
2338          type == Experiment::ENABLE_DISABLE_VALUE);
2339   DCHECK_LT(index, num_choices);
2340   return std::string(internal_name) + testing::kMultiSeparator +
2341          base::IntToString(index);
2342 }
2343
2344 base::string16 Experiment::DescriptionForChoice(int index) const {
2345   DCHECK(type == Experiment::MULTI_VALUE ||
2346          type == Experiment::ENABLE_DISABLE_VALUE);
2347   DCHECK_LT(index, num_choices);
2348   int description_id;
2349   if (type == Experiment::ENABLE_DISABLE_VALUE) {
2350     const int kEnableDisableDescriptionIds[] = {
2351       IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT,
2352       IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
2353       IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
2354     };
2355     description_id = kEnableDisableDescriptionIds[index];
2356   } else {
2357     description_id = choices[index].description_id;
2358   }
2359   return l10n_util::GetStringUTF16(description_id);
2360 }
2361
2362 void ConvertFlagsToSwitches(FlagsStorage* flags_storage,
2363                             base::CommandLine* command_line,
2364                             SentinelsMode sentinels) {
2365   FlagsState::GetInstance()->ConvertFlagsToSwitches(flags_storage,
2366                                                     command_line,
2367                                                     sentinels);
2368 }
2369
2370 bool AreSwitchesIdenticalToCurrentCommandLine(
2371     const base::CommandLine& new_cmdline,
2372     const base::CommandLine& active_cmdline,
2373     std::set<base::CommandLine::StringType>* out_difference) {
2374   std::set<base::CommandLine::StringType> new_flags =
2375       ExtractFlagsFromCommandLine(new_cmdline);
2376   std::set<base::CommandLine::StringType> active_flags =
2377       ExtractFlagsFromCommandLine(active_cmdline);
2378
2379   bool result = false;
2380   // Needed because std::equal doesn't check if the 2nd set is empty.
2381   if (new_flags.size() == active_flags.size()) {
2382     result =
2383         std::equal(new_flags.begin(), new_flags.end(), active_flags.begin());
2384   }
2385
2386   if (out_difference && !result) {
2387     std::set_symmetric_difference(
2388         new_flags.begin(),
2389         new_flags.end(),
2390         active_flags.begin(),
2391         active_flags.end(),
2392         std::inserter(*out_difference, out_difference->begin()));
2393   }
2394
2395   return result;
2396 }
2397
2398 void GetFlagsExperimentsData(FlagsStorage* flags_storage,
2399                              FlagAccess access,
2400                              base::ListValue* supported_experiments,
2401                              base::ListValue* unsupported_experiments) {
2402   std::set<std::string> enabled_experiments;
2403   GetSanitizedEnabledFlags(flags_storage, &enabled_experiments);
2404
2405   int current_platform = GetCurrentPlatform();
2406
2407   for (size_t i = 0; i < num_experiments; ++i) {
2408     const Experiment& experiment = experiments[i];
2409     if (SkipConditionalExperiment(experiment))
2410       continue;
2411
2412     base::DictionaryValue* data = new base::DictionaryValue();
2413     data->SetString("internal_name", experiment.internal_name);
2414     data->SetString("name",
2415                     l10n_util::GetStringUTF16(experiment.visible_name_id));
2416     data->SetString("description",
2417                     l10n_util::GetStringUTF16(
2418                         experiment.visible_description_id));
2419
2420     base::ListValue* supported_platforms = new base::ListValue();
2421     AddOsStrings(experiment.supported_platforms, supported_platforms);
2422     data->Set("supported_platforms", supported_platforms);
2423     // True if the switch is not currently passed.
2424     bool is_default_value = IsDefaultValue(experiment, enabled_experiments);
2425     data->SetBoolean("is_default", is_default_value);
2426
2427     switch (experiment.type) {
2428       case Experiment::SINGLE_VALUE:
2429       case Experiment::SINGLE_DISABLE_VALUE:
2430         data->SetBoolean(
2431             "enabled",
2432             (!is_default_value &&
2433              experiment.type == Experiment::SINGLE_VALUE) ||
2434             (is_default_value &&
2435              experiment.type == Experiment::SINGLE_DISABLE_VALUE));
2436         break;
2437       case Experiment::MULTI_VALUE:
2438       case Experiment::ENABLE_DISABLE_VALUE:
2439         data->Set("choices", CreateChoiceData(experiment, enabled_experiments));
2440         break;
2441       default:
2442         NOTREACHED();
2443     }
2444
2445     bool supported = (experiment.supported_platforms & current_platform) != 0;
2446 #if defined(OS_CHROMEOS)
2447     if (access == kOwnerAccessToFlags &&
2448         (experiment.supported_platforms & kOsCrOSOwnerOnly) != 0) {
2449       supported = true;
2450     }
2451 #endif
2452     if (supported)
2453       supported_experiments->Append(data);
2454     else
2455       unsupported_experiments->Append(data);
2456   }
2457 }
2458
2459 bool IsRestartNeededToCommitChanges() {
2460   return FlagsState::GetInstance()->IsRestartNeededToCommitChanges();
2461 }
2462
2463 void SetExperimentEnabled(FlagsStorage* flags_storage,
2464                           const std::string& internal_name,
2465                           bool enable) {
2466   FlagsState::GetInstance()->SetExperimentEnabled(flags_storage,
2467                                                   internal_name, enable);
2468 }
2469
2470 void RemoveFlagsSwitches(
2471     std::map<std::string, base::CommandLine::StringType>* switch_list) {
2472   FlagsState::GetInstance()->RemoveFlagsSwitches(switch_list);
2473 }
2474
2475 void ResetAllFlags(FlagsStorage* flags_storage) {
2476   FlagsState::GetInstance()->ResetAllFlags(flags_storage);
2477 }
2478
2479 int GetCurrentPlatform() {
2480 #if defined(OS_MACOSX)
2481   return kOsMac;
2482 #elif defined(OS_WIN)
2483   return kOsWin;
2484 #elif defined(OS_CHROMEOS)  // Needs to be before the OS_LINUX check.
2485   return kOsCrOS;
2486 #elif defined(OS_LINUX) || defined(OS_OPENBSD)
2487   return kOsLinux;
2488 #elif defined(OS_ANDROID)
2489   return kOsAndroid;
2490 #else
2491 #error Unknown platform
2492 #endif
2493 }
2494
2495 void RecordUMAStatistics(FlagsStorage* flags_storage) {
2496   std::set<std::string> flags = flags_storage->GetFlags();
2497   for (const std::string& flag : flags) {
2498     std::string action("AboutFlags_");
2499     action += flag;
2500     content::RecordComputedAction(action);
2501   }
2502   // Since flag metrics are recorded every startup, add a tick so that the
2503   // stats can be made meaningful.
2504   if (flags.size())
2505     content::RecordAction(base::UserMetricsAction("AboutFlags_StartupTick"));
2506   content::RecordAction(base::UserMetricsAction("StartupTick"));
2507 }
2508
2509 base::HistogramBase::Sample GetSwitchUMAId(const std::string& switch_name) {
2510   return static_cast<base::HistogramBase::Sample>(
2511       metrics::HashMetricName(switch_name));
2512 }
2513
2514 void ReportCustomFlags(const std::string& uma_histogram_hame,
2515                        const std::set<std::string>& command_line_difference) {
2516   for (const std::string& flag : command_line_difference) {
2517     int uma_id = about_flags::testing::kBadSwitchFormatHistogramId;
2518     if (base::StartsWith(flag, "--", base::CompareCase::SENSITIVE)) {
2519       // Skip '--' before switch name.
2520       std::string switch_name(flag.substr(2));
2521
2522       // Kill value, if any.
2523       const size_t value_pos = switch_name.find('=');
2524       if (value_pos != std::string::npos)
2525         switch_name.resize(value_pos);
2526
2527       uma_id = GetSwitchUMAId(switch_name);
2528     } else {
2529       NOTREACHED() << "ReportCustomFlags(): flag '" << flag
2530                    << "' has incorrect format.";
2531     }
2532     DVLOG(1) << "ReportCustomFlags(): histogram='" << uma_histogram_hame
2533              << "' '" << flag << "', uma_id=" << uma_id;
2534
2535     // Sparse histogram macro does not cache the histogram, so it's safe
2536     // to use macro with non-static histogram name here.
2537     UMA_HISTOGRAM_SPARSE_SLOWLY(uma_histogram_hame, uma_id);
2538   }
2539 }
2540
2541 //////////////////////////////////////////////////////////////////////////////
2542 // FlagsState implementation.
2543
2544 namespace {
2545
2546 typedef std::map<std::string, std::pair<std::string, std::string> >
2547     NameToSwitchAndValueMap;
2548
2549 void SetFlagToSwitchMapping(const std::string& key,
2550                             const std::string& switch_name,
2551                             const std::string& switch_value,
2552                             NameToSwitchAndValueMap* name_to_switch_map) {
2553   DCHECK(name_to_switch_map->end() == name_to_switch_map->find(key));
2554   (*name_to_switch_map)[key] = std::make_pair(switch_name, switch_value);
2555 }
2556
2557 void FlagsState::ConvertFlagsToSwitches(FlagsStorage* flags_storage,
2558                                         base::CommandLine* command_line,
2559                                         SentinelsMode sentinels) {
2560   if (command_line->HasSwitch(switches::kNoExperiments))
2561     return;
2562
2563   std::set<std::string> enabled_experiments;
2564
2565   GetSanitizedEnabledFlagsForCurrentPlatform(flags_storage,
2566                                              &enabled_experiments);
2567
2568   NameToSwitchAndValueMap name_to_switch_map;
2569   for (size_t i = 0; i < num_experiments; ++i) {
2570     const Experiment& e = experiments[i];
2571     if (e.type == Experiment::SINGLE_VALUE ||
2572         e.type == Experiment::SINGLE_DISABLE_VALUE) {
2573       SetFlagToSwitchMapping(e.internal_name, e.command_line_switch,
2574                              e.command_line_value, &name_to_switch_map);
2575     } else if (e.type == Experiment::MULTI_VALUE) {
2576       for (int j = 0; j < e.num_choices; ++j) {
2577         SetFlagToSwitchMapping(e.NameForChoice(j),
2578                                e.choices[j].command_line_switch,
2579                                e.choices[j].command_line_value,
2580                                &name_to_switch_map);
2581       }
2582     } else {
2583       DCHECK_EQ(e.type, Experiment::ENABLE_DISABLE_VALUE);
2584       SetFlagToSwitchMapping(e.NameForChoice(0), std::string(), std::string(),
2585                              &name_to_switch_map);
2586       SetFlagToSwitchMapping(e.NameForChoice(1), e.command_line_switch,
2587                              e.command_line_value, &name_to_switch_map);
2588       SetFlagToSwitchMapping(e.NameForChoice(2), e.disable_command_line_switch,
2589                              e.disable_command_line_value, &name_to_switch_map);
2590     }
2591   }
2592
2593   if (sentinels == kAddSentinels) {
2594     command_line->AppendSwitch(switches::kFlagSwitchesBegin);
2595     flags_switches_.insert(
2596         std::pair<std::string, std::string>(switches::kFlagSwitchesBegin,
2597                                             std::string()));
2598   }
2599   for (const std::string& experiment_name : enabled_experiments) {
2600     NameToSwitchAndValueMap::const_iterator name_to_switch_it =
2601         name_to_switch_map.find(experiment_name);
2602     if (name_to_switch_it == name_to_switch_map.end()) {
2603       NOTREACHED();
2604       continue;
2605     }
2606
2607     const std::pair<std::string, std::string>&
2608         switch_and_value_pair = name_to_switch_it->second;
2609
2610     CHECK(!switch_and_value_pair.first.empty());
2611     command_line->AppendSwitchASCII(switch_and_value_pair.first,
2612                                     switch_and_value_pair.second);
2613     flags_switches_[switch_and_value_pair.first] = switch_and_value_pair.second;
2614   }
2615   if (sentinels == kAddSentinels) {
2616     command_line->AppendSwitch(switches::kFlagSwitchesEnd);
2617     flags_switches_.insert(
2618         std::pair<std::string, std::string>(switches::kFlagSwitchesEnd,
2619                                             std::string()));
2620   }
2621 }
2622
2623 bool FlagsState::IsRestartNeededToCommitChanges() {
2624   return needs_restart_;
2625 }
2626
2627 void FlagsState::SetExperimentEnabled(FlagsStorage* flags_storage,
2628                                       const std::string& internal_name,
2629                                       bool enable) {
2630   size_t at_index = internal_name.find(testing::kMultiSeparator);
2631   if (at_index != std::string::npos) {
2632     DCHECK(enable);
2633     // We're being asked to enable a multi-choice experiment. Disable the
2634     // currently selected choice.
2635     DCHECK_NE(at_index, 0u);
2636     const std::string experiment_name = internal_name.substr(0, at_index);
2637     SetExperimentEnabled(flags_storage, experiment_name, false);
2638
2639     // And enable the new choice, if it is not the default first choice.
2640     if (internal_name != experiment_name + "@0") {
2641       std::set<std::string> enabled_experiments;
2642       GetSanitizedEnabledFlags(flags_storage, &enabled_experiments);
2643       needs_restart_ |= enabled_experiments.insert(internal_name).second;
2644       flags_storage->SetFlags(enabled_experiments);
2645     }
2646     return;
2647   }
2648
2649   std::set<std::string> enabled_experiments;
2650   GetSanitizedEnabledFlags(flags_storage, &enabled_experiments);
2651
2652   const Experiment* e = NULL;
2653   for (size_t i = 0; i < num_experiments; ++i) {
2654     if (experiments[i].internal_name == internal_name) {
2655       e = experiments + i;
2656       break;
2657     }
2658   }
2659   DCHECK(e);
2660
2661   if (e->type == Experiment::SINGLE_VALUE) {
2662     if (enable)
2663       needs_restart_ |= enabled_experiments.insert(internal_name).second;
2664     else
2665       needs_restart_ |= (enabled_experiments.erase(internal_name) > 0);
2666   } else if (e->type == Experiment::SINGLE_DISABLE_VALUE) {
2667     if (!enable)
2668       needs_restart_ |= enabled_experiments.insert(internal_name).second;
2669     else
2670       needs_restart_ |= (enabled_experiments.erase(internal_name) > 0);
2671   } else {
2672     if (enable) {
2673       // Enable the first choice.
2674       needs_restart_ |= enabled_experiments.insert(e->NameForChoice(0)).second;
2675     } else {
2676       // Find the currently enabled choice and disable it.
2677       for (int i = 0; i < e->num_choices; ++i) {
2678         std::string choice_name = e->NameForChoice(i);
2679         if (enabled_experiments.find(choice_name) !=
2680             enabled_experiments.end()) {
2681           needs_restart_ = true;
2682           enabled_experiments.erase(choice_name);
2683           // Continue on just in case there's a bug and more than one
2684           // experiment for this choice was enabled.
2685         }
2686       }
2687     }
2688   }
2689
2690   flags_storage->SetFlags(enabled_experiments);
2691 }
2692
2693 void FlagsState::RemoveFlagsSwitches(
2694     std::map<std::string, base::CommandLine::StringType>* switch_list) {
2695   for (const auto& entry : flags_switches_)
2696     switch_list->erase(entry.first);
2697 }
2698
2699 void FlagsState::ResetAllFlags(FlagsStorage* flags_storage) {
2700   needs_restart_ = true;
2701
2702   std::set<std::string> no_experiments;
2703   flags_storage->SetFlags(no_experiments);
2704 }
2705
2706 void FlagsState::reset() {
2707   needs_restart_ = false;
2708   flags_switches_.clear();
2709 }
2710
2711 }  // namespace
2712
2713 namespace testing {
2714
2715 // WARNING: '@' is also used in the html file. If you update this constant you
2716 // also need to update the html file.
2717 const char kMultiSeparator[] = "@";
2718
2719 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
2720
2721 void ClearState() {
2722   FlagsState::GetInstance()->reset();
2723 }
2724
2725 void SetExperiments(const Experiment* e, size_t count) {
2726   if (!e) {
2727     experiments = kExperiments;
2728     num_experiments = arraysize(kExperiments);
2729   } else {
2730     experiments = e;
2731     num_experiments = count;
2732   }
2733 }
2734
2735 const Experiment* GetExperiments(size_t* count) {
2736   *count = num_experiments;
2737   return experiments;
2738 }
2739
2740 }  // namespace testing
2741
2742 }  // namespace about_flags