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