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 "media/midi/midi_switches.h"
  44 #include "ui/base/l10n/l10n_util.h"
  45 #include "ui/base/ui_base_switches.h"
  46 #include "ui/display/display_switches.h"
  47 #include "ui/events/event_switches.h"
  48 #include "ui/gfx/switches.h"
  49 #include "ui/gl/gl_switches.h"
  50 #include "ui/keyboard/keyboard_switches.h"
  51 #include "ui/native_theme/native_theme_switches.h"
  52 #include "ui/views/views_switches.h"
  53
  54 #if defined(OS_ANDROID)
  55 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_switches.h"
  56 #else
  57 #include "ui/message_center/message_center_switches.h"
  58 #endif
  59
  60 #if defined(USE_ASH)
  61 #include "ash/ash_switches.h"
  62 #endif
  63
  64 #if defined(OS_CHROMEOS)
  65 #include "chromeos/chromeos_switches.h"
  66 #include "third_party/cros_system_api/switches/chrome_switches.h"
  67 #endif
  68
  69 #if defined(ENABLE_APP_LIST)
  70 #include "ui/app_list/app_list_switches.h"
  71 #endif
  72
  73 #if defined(ENABLE_EXTENSIONS)
  74 #include "extensions/common/switches.h"
  75 #endif
  76
  77 #if defined(USE_OZONE)
  78 #include "ui/ozone/public/ozone_switches.h"
  79 #endif
  80
  81 namespace about_flags {
  82
  83 // Macros to simplify specifying the type.
  84 #define SINGLE_VALUE_TYPE_AND_VALUE(command_line_switch, switch_value) \
  85     Experiment::SINGLE_VALUE, \
  86     command_line_switch, switch_value, NULL, NULL, NULL, 0
  87 #define SINGLE_VALUE_TYPE(command_line_switch) \
  88     SINGLE_VALUE_TYPE_AND_VALUE(command_line_switch, "")
  89 #define SINGLE_DISABLE_VALUE_TYPE_AND_VALUE(command_line_switch, switch_value) \
  90     Experiment::SINGLE_DISABLE_VALUE, \
  91     command_line_switch, switch_value, NULL, NULL, NULL, 0
  92 #define SINGLE_DISABLE_VALUE_TYPE(command_line_switch) \
  93     SINGLE_DISABLE_VALUE_TYPE_AND_VALUE(command_line_switch, "")
  94 #define ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(enable_switch, enable_value, \
  95                                             disable_switch, disable_value) \
  96     Experiment::ENABLE_DISABLE_VALUE, enable_switch, enable_value, \
  97     disable_switch, disable_value, NULL, 3
  98 #define ENABLE_DISABLE_VALUE_TYPE(enable_switch, disable_switch) \
  99     ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(enable_switch, "", disable_switch, "")
 100 #define MULTI_VALUE_TYPE(choices) \
 101     Experiment::MULTI_VALUE, NULL, NULL, NULL, NULL, choices, arraysize(choices)
 102
 103 namespace {
 104
 105 // Enumeration of OSs.
 106 enum {
 107   kOsMac = 1 << 0,
 108   kOsWin = 1 << 1,
 109   kOsLinux = 1 << 2,
 110   kOsCrOS = 1 << 3,
 111   kOsAndroid = 1 << 4,
 112   kOsCrOSOwnerOnly = 1 << 5
 113 };
 114
 115 const unsigned kOsAll = kOsMac | kOsWin | kOsLinux | kOsCrOS | kOsAndroid;
 116 const unsigned kOsDesktop = kOsMac | kOsWin | kOsLinux | kOsCrOS;
 117
 118 // Adds a |StringValue| to |list| for each platform where |bitmask| indicates
 119 // whether the experiment is available on that platform.
 120 void AddOsStrings(unsigned bitmask, base::ListValue* list) {
 121   struct {
 122     unsigned bit;
 123     const char* const name;
 124   } kBitsToOs[] = {
 125     {kOsMac, "Mac"},
 126     {kOsWin, "Windows"},
 127     {kOsLinux, "Linux"},
 128     {kOsCrOS, "Chrome OS"},
 129     {kOsAndroid, "Android"},
 130     {kOsCrOSOwnerOnly, "Chrome OS (owner only)"},
 131   };
 132   for (size_t i = 0; i < arraysize(kBitsToOs); ++i) {
 133     if (bitmask & kBitsToOs[i].bit)
 134       list->Append(new base::StringValue(kBitsToOs[i].name));
 135   }
 136 }
 137
 138 // Convert switch constants to proper CommandLine::StringType strings.
 139 base::CommandLine::StringType GetSwitchString(const std::string& flag) {
 140   base::CommandLine cmd_line(base::CommandLine::NO_PROGRAM);
 141   cmd_line.AppendSwitch(flag);
 142   DCHECK_EQ(2U, cmd_line.argv().size());
 143   return cmd_line.argv()[1];
 144 }
 145
 146 // Scoops flags from a command line.
 147 std::set<base::CommandLine::StringType> ExtractFlagsFromCommandLine(
 148     const base::CommandLine& cmdline) {
 149   std::set<base::CommandLine::StringType> flags;
 150   // First do the ones between --flag-switches-begin and --flag-switches-end.
 151   base::CommandLine::StringVector::const_iterator first =
 152       std::find(cmdline.argv().begin(), cmdline.argv().end(),
 153                 GetSwitchString(switches::kFlagSwitchesBegin));
 154   base::CommandLine::StringVector::const_iterator last =
 155       std::find(cmdline.argv().begin(), cmdline.argv().end(),
 156                 GetSwitchString(switches::kFlagSwitchesEnd));
 157   if (first != cmdline.argv().end() && last != cmdline.argv().end())
 158     flags.insert(first + 1, last);
 159 #if defined(OS_CHROMEOS)
 160   // Then add those between --policy-switches-begin and --policy-switches-end.
 161   first = std::find(cmdline.argv().begin(), cmdline.argv().end(),
 162                     GetSwitchString(chromeos::switches::kPolicySwitchesBegin));
 163   last = std::find(cmdline.argv().begin(), cmdline.argv().end(),
 164                    GetSwitchString(chromeos::switches::kPolicySwitchesEnd));
 165   if (first != cmdline.argv().end() && last != cmdline.argv().end())
 166     flags.insert(first + 1, last);
 167 #endif
 168   return flags;
 169 }
 170
 171 const Experiment::Choice kTouchEventsChoices[] = {
 172   { IDS_GENERIC_EXPERIMENT_CHOICE_AUTOMATIC, "", "" },
 173   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 174     switches::kTouchEvents,
 175     switches::kTouchEventsEnabled },
 176   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 177     switches::kTouchEvents,
 178     switches::kTouchEventsDisabled }
 179 };
 180
 181 #if defined(USE_AURA)
 182 const Experiment::Choice kOverscrollHistoryNavigationChoices[] = {
 183   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED, "", "" },
 184   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 185     switches::kOverscrollHistoryNavigation,
 186     "0" },
 187   { IDS_OVERSCROLL_HISTORY_NAVIGATION_SIMPLE_UI,
 188     switches::kOverscrollHistoryNavigation,
 189     "2" }
 190 };
 191 #endif
 192
 193 const Experiment::Choice kTouchTextSelectionStrategyChoices[] = {
 194   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 195   { IDS_TOUCH_SELECTION_STRATEGY_CHARACTER,
 196     switches::kTouchTextSelectionStrategy,
 197     "character" },
 198   { IDS_TOUCH_SELECTION_STRATEGY_DIRECTION,
 199     switches::kTouchTextSelectionStrategy,
 200     "direction" }
 201 };
 202
 203 #if !defined(DISABLE_NACL)
 204 const Experiment::Choice kNaClDebugMaskChoices[] = {
 205   // Secure shell can be used on ChromeOS for forwarding the TCP port opened by
 206   // debug stub to a remote machine. Since secure shell uses NaCl, we usually
 207   // want to avoid debugging that. The PNaCl translator is also a NaCl module,
 208   // so by default we want to avoid debugging that.
 209   // NOTE: As the default value must be the empty string, the mask excluding
 210   // the PNaCl translator and secure shell is substituted elsewhere.
 211   { IDS_NACL_DEBUG_MASK_CHOICE_EXCLUDE_UTILS_PNACL, "", "" },
 212   { IDS_NACL_DEBUG_MASK_CHOICE_DEBUG_ALL, switches::kNaClDebugMask, "*://*" },
 213   { IDS_NACL_DEBUG_MASK_CHOICE_INCLUDE_DEBUG,
 214       switches::kNaClDebugMask, "*://*/*debug.nmf" }
 215 };
 216 #endif
 217
 218 const Experiment::Choice kMarkNonSecureAsChoices[] = {
 219     { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 220     { IDS_MARK_NON_SECURE_AS_NEUTRAL,
 221         switches::kMarkNonSecureAs, switches::kMarkNonSecureAsNeutral},
 222     { IDS_MARK_NON_SECURE_AS_NON_SECURE,
 223         switches::kMarkNonSecureAs, switches::kMarkNonSecureAsNonSecure}
 224 };
 225
 226 const Experiment::Choice kDataReductionProxyLoFiChoices[] = {
 227     { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 228     { IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_ALWAYS_ON,
 229         data_reduction_proxy::switches::kDataReductionProxyLoFi,
 230         data_reduction_proxy::switches::kDataReductionProxyLoFiValueAlwaysOn},
 231     { IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_CELLULAR_ONLY,
 232         data_reduction_proxy::switches::kDataReductionProxyLoFi,
 233         data_reduction_proxy::switches::
 234             kDataReductionProxyLoFiValueCellularOnly},
 235     { IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_DISABLED,
 236         data_reduction_proxy::switches::kDataReductionProxyLoFi,
 237         data_reduction_proxy::switches::kDataReductionProxyLoFiValueDisabled},
 238     { IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_SLOW_CONNECTIONS_ONLY,
 239         data_reduction_proxy::switches::kDataReductionProxyLoFi,
 240         data_reduction_proxy::switches::
 241             kDataReductionProxyLoFiValueSlowConnectionsOnly}
 242 };
 243
 244 const Experiment::Choice kShowSavedCopyChoices[] = {
 245   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 246   { IDS_FLAGS_ENABLE_SHOW_SAVED_COPY_PRIMARY,
 247     switches::kShowSavedCopy, switches::kEnableShowSavedCopyPrimary },
 248   { IDS_FLAGS_ENABLE_SHOW_SAVED_COPY_SECONDARY,
 249     switches::kShowSavedCopy, switches::kEnableShowSavedCopySecondary },
 250   { IDS_FLAGS_DISABLE_SHOW_SAVED_COPY,
 251     switches::kShowSavedCopy, switches::kDisableShowSavedCopy }
 252 };
 253
 254 const Experiment::Choice kDefaultTileWidthChoices[] = {
 255   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 256   { IDS_FLAGS_DEFAULT_TILE_WIDTH_SHORT,
 257     switches::kDefaultTileWidth, "128"},
 258   { IDS_FLAGS_DEFAULT_TILE_WIDTH_TALL,
 259     switches::kDefaultTileWidth, "256"},
 260   { IDS_FLAGS_DEFAULT_TILE_WIDTH_GRANDE,
 261     switches::kDefaultTileWidth, "512"},
 262   { IDS_FLAGS_DEFAULT_TILE_WIDTH_VENTI,
 263     switches::kDefaultTileWidth, "1024"}
 264 };
 265
 266 const Experiment::Choice kDefaultTileHeightChoices[] = {
 267   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 268   { IDS_FLAGS_DEFAULT_TILE_HEIGHT_SHORT,
 269     switches::kDefaultTileHeight, "128"},
 270   { IDS_FLAGS_DEFAULT_TILE_HEIGHT_TALL,
 271     switches::kDefaultTileHeight, "256"},
 272   { IDS_FLAGS_DEFAULT_TILE_HEIGHT_GRANDE,
 273     switches::kDefaultTileHeight, "512"},
 274   { IDS_FLAGS_DEFAULT_TILE_HEIGHT_VENTI,
 275     switches::kDefaultTileHeight, "1024"}
 276 };
 277
 278 const Experiment::Choice kSimpleCacheBackendChoices[] = {
 279   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 280   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 281     switches::kUseSimpleCacheBackend, "off" },
 282   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 283     switches::kUseSimpleCacheBackend, "on"}
 284 };
 285
 286 #if defined(USE_AURA)
 287 const Experiment::Choice kTabCaptureUpscaleQualityChoices[] = {
 288   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 289   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_FAST,
 290     switches::kTabCaptureUpscaleQuality, "fast" },
 291   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_GOOD,
 292     switches::kTabCaptureUpscaleQuality, "good" },
 293   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_BEST,
 294     switches::kTabCaptureUpscaleQuality, "best" },
 295 };
 296
 297 const Experiment::Choice kTabCaptureDownscaleQualityChoices[] = {
 298   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 299   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_FAST,
 300     switches::kTabCaptureDownscaleQuality, "fast" },
 301   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_GOOD,
 302     switches::kTabCaptureDownscaleQuality, "good" },
 303   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_BEST,
 304     switches::kTabCaptureDownscaleQuality, "best" },
 305 };
 306 #endif
 307
 308 #if defined(OS_ANDROID)
 309 const Experiment::Choice kReaderModeHeuristicsChoices[] = {
 310     { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
 311     { IDS_FLAGS_READER_MODE_HEURISTICS_MARKUP,
 312       switches::kReaderModeHeuristics,
 313       switches::reader_mode_heuristics::kOGArticle },
 314     { IDS_FLAGS_READER_MODE_HEURISTICS_ADABOOST,
 315       switches::kReaderModeHeuristics,
 316       switches::reader_mode_heuristics::kAdaBoost },
 317     { IDS_FLAGS_READER_MODE_HEURISTICS_ALWAYS_ON,
 318       switches::kReaderModeHeuristics,
 319       switches::reader_mode_heuristics::kAlwaysTrue },
 320     { IDS_FLAGS_READER_MODE_HEURISTICS_ALWAYS_OFF,
 321       switches::kReaderModeHeuristics,
 322       switches::reader_mode_heuristics::kNone },
 323 };
 324 #endif
 325
 326 const Experiment::Choice kNumRasterThreadsChoices[] = {
 327   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 328   { IDS_FLAGS_NUM_RASTER_THREADS_ONE, switches::kNumRasterThreads, "1" },
 329   { IDS_FLAGS_NUM_RASTER_THREADS_TWO, switches::kNumRasterThreads, "2" },
 330   { IDS_FLAGS_NUM_RASTER_THREADS_THREE, switches::kNumRasterThreads, "3" },
 331   { IDS_FLAGS_NUM_RASTER_THREADS_FOUR, switches::kNumRasterThreads, "4" }
 332 };
 333
 334 const Experiment::Choice kGpuRasterizationMSAASampleCountChoices[] = {
 335   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT,
 336     "",
 337     "" },
 338   { IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_ZERO,
 339     switches::kGpuRasterizationMSAASampleCount, "0" },
 340   { IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_TWO,
 341     switches::kGpuRasterizationMSAASampleCount, "2" },
 342   { IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_FOUR,
 343     switches::kGpuRasterizationMSAASampleCount, "4" },
 344   { IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_EIGHT,
 345     switches::kGpuRasterizationMSAASampleCount, "8" },
 346   { IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_SIXTEEN,
 347     switches::kGpuRasterizationMSAASampleCount, "16" },
 348 };
 349
 350 const Experiment::Choice kEnableGpuRasterizationChoices[] = {
 351   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 352   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 353     switches::kEnableGpuRasterization, "" },
 354   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 355     switches::kDisableGpuRasterization, "" },
 356   { IDS_FLAGS_FORCE_GPU_RASTERIZATION,
 357     switches::kForceGpuRasterization, "" },
 358 };
 359
 360 #if defined(OS_CHROMEOS)
 361 const Experiment::Choice kMemoryPressureThresholdChoices[] = {
 362     { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 363     { IDS_FLAGS_CONSERVATIVE_THRESHOLDS,
 364       chromeos::switches::kMemoryPressureThresholds,
 365       chromeos::switches::kConservativeThreshold },
 366     { IDS_FLAGS_AGGRESSIVE_CACHE_DISCARD_THRESHOLDS,
 367       chromeos::switches::kMemoryPressureThresholds,
 368       chromeos::switches::kAggressiveCacheDiscardThreshold },
 369     { IDS_FLAGS_AGGRESSIVE_TAB_DISCARD_THRESHOLDS,
 370       chromeos::switches::kMemoryPressureThresholds,
 371       chromeos::switches::kAggressiveTabDiscardThreshold },
 372     { IDS_FLAGS_AGGRESSIVE_THRESHOLDS,
 373       chromeos::switches::kMemoryPressureThresholds,
 374       chromeos::switches::kAggressiveThreshold },
 375 };
 376 #endif
 377
 378 const Experiment::Choice kExtensionContentVerificationChoices[] = {
 379   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 380   { IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_BOOTSTRAP,
 381     switches::kExtensionContentVerification,
 382     switches::kExtensionContentVerificationBootstrap },
 383   { IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_ENFORCE,
 384     switches::kExtensionContentVerification,
 385     switches::kExtensionContentVerificationEnforce },
 386   { IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_ENFORCE_STRICT,
 387     switches::kExtensionContentVerification,
 388     switches::kExtensionContentVerificationEnforceStrict },
 389 };
 390
 391 const Experiment::Choice kAutofillSyncCredentialChoices[] = {
 392   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
 393   { IDS_ALLOW_AUTOFILL_SYNC_CREDENTIAL,
 394     password_manager::switches::kAllowAutofillSyncCredential, ""},
 395   { IDS_DISALLOW_AUTOFILL_SYNC_CREDENTIAL_FOR_REAUTH,
 396     password_manager::switches::kDisallowAutofillSyncCredentialForReauth, ""},
 397   { IDS_DISALLOW_AUTOFILL_SYNC_CREDENTIAL,
 398     password_manager::switches::kDisallowAutofillSyncCredential, ""},
 399 };
 400
 401 const Experiment::Choice kFillOnAccountSelectChoices[] = {
 402   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 403   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 404     autofill::switches::kDisableFillOnAccountSelect, "" },
 405   { IDS_FLAGS_FILL_ON_ACCOUNT_SELECT_ENABLE_HIGHLIGHTING,
 406     autofill::switches::kEnableFillOnAccountSelect, "" },
 407   { IDS_FLAGS_FILL_ON_ACCOUNT_SELECT_ENABLE_NO_HIGHLIGHTING,
 408     autofill::switches::kEnableFillOnAccountSelectNoHighlighting, "" },
 409 };
 410
 411 #if defined(ENABLE_TOPCHROME_MD)
 412 const Experiment::Choice kTopChromeMaterialDesignChoices[] = {
 413     {IDS_FLAGS_TOP_CHROME_MD_NON_MATERIAL, "", ""},
 414     {IDS_FLAGS_TOP_CHROME_MD_MATERIAL,
 415      switches::kTopChromeMD,
 416      switches::kTopChromeMDMaterial},
 417     {IDS_FLAGS_TOP_CHROME_MD_MATERIAL_HYBRID,
 418      switches::kTopChromeMD,
 419      switches::kTopChromeMDMaterialHybrid}};
 420 #endif
 421
 422 #if defined(OS_CHROMEOS)
 423
 424 const Experiment::Choice kAshMaterialDesignInkDropAnimationSpeed[] = {
 425     {IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
 426     {IDS_FLAGS_MATERIAL_DESIGN_INK_DROP_ANIMATION_FAST,
 427      switches::kMaterialDesignInkDropAnimationSpeed,
 428      switches::kMaterialDesignInkDropAnimationSpeedFast},
 429     {IDS_FLAGS_MATERIAL_DESIGN_INK_DROP_ANIMATION_SLOW,
 430      switches::kMaterialDesignInkDropAnimationSpeed,
 431      switches::kMaterialDesignInkDropAnimationSpeedSlow}};
 432
 433 const Experiment::Choice kDataSaverPromptChoices[] = {
 434   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 435   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 436     chromeos::switches::kEnableDataSaverPrompt, "" },
 437   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 438     chromeos::switches::kDisableDataSaverPrompt, "" },
 439   { IDS_FLAGS_DATASAVER_PROMPT_DEMO_MODE,
 440     chromeos::switches::kEnableDataSaverPrompt,
 441     chromeos::switches::kDataSaverPromptDemoMode },
 442 };
 443
 444 const Experiment::Choice kFloatingVirtualKeyboardChoices[] = {
 445   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 446   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 447     keyboard::switches::kFloatingVirtualKeyboard,
 448     keyboard::switches::kFloatingVirtualKeyboardDisabled},
 449   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 450     keyboard::switches::kFloatingVirtualKeyboard,
 451     keyboard::switches::kFloatingVirtualKeyboardEnabled},
 452 };
 453
 454 const Experiment::Choice kSmartVirtualKeyboardChoices[] = {
 455   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 456   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 457     keyboard::switches::kSmartVirtualKeyboard,
 458     keyboard::switches::kSmartVirtualKeyboardDisabled},
 459   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 460     keyboard::switches::kSmartVirtualKeyboard,
 461     keyboard::switches::kSmartVirtualKeyboardEnabled},
 462 };
 463
 464 const Experiment::Choice kGestureTypingChoices[] = {
 465   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 466   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 467     keyboard::switches::kGestureTyping,
 468     keyboard::switches::kGestureTypingDisabled},
 469   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 470     keyboard::switches::kGestureTyping,
 471     keyboard::switches::kGestureTypingEnabled},
 472 };
 473
 474 const Experiment::Choice kGestureEditingChoices[] = {
 475   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 476   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 477     keyboard::switches::kGestureEditing,
 478     keyboard::switches::kGestureEditingDisabled},
 479   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 480     keyboard::switches::kGestureEditing,
 481     keyboard::switches::kGestureEditingEnabled},
 482 };
 483 #endif
 484
 485 const Experiment::Choice kDownloadNotificationChoices[] = {
 486   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 487   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 488     switches::kEnableDownloadNotification,
 489     "enabled" },
 490   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 491     switches::kEnableDownloadNotification,
 492     "disabled" }
 493 };
 494
 495 const Experiment::Choice kSupervisedUserSafeSitesChoices[] = {
 496   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 497   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 498     switches::kSupervisedUserSafeSites,
 499     "enabled" },
 500   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 501     switches::kSupervisedUserSafeSites,
 502     "disabled" },
 503   { IDS_SUPERVISED_USER_SAFESITES_BLACKLIST_ONLY,
 504     switches::kSupervisedUserSafeSites,
 505     "blacklist-only" },
 506   { IDS_SUPERVISED_USER_SAFESITES_ONLINE_CHECK_ONLY,
 507     switches::kSupervisedUserSafeSites,
 508     "online-check-only" }
 509 };
 510
 511 const Experiment::Choice kV8CacheOptionsChoices[] = {
 512   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 513   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED, switches::kV8CacheOptions, "none" },
 514   { IDS_FLAGS_V8_CACHE_OPTIONS_PARSE, switches::kV8CacheOptions, "parse" },
 515   { IDS_FLAGS_V8_CACHE_OPTIONS_CODE, switches::kV8CacheOptions, "code" },
 516 };
 517
 518 #if defined(OS_ANDROID)
 519 const Experiment::Choice kProgressBarAnimationChoices[] = {
 520   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 521   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 522       switches::kProgressBarAnimation, "disabled" },
 523   { IDS_FLAGS_PROGRESS_BAR_ANIMATION_LINEAR,
 524         switches::kProgressBarAnimation, "linear" },
 525   { IDS_FLAGS_PROGRESS_BAR_ANIMATION_SMOOTH,
 526       switches::kProgressBarAnimation, "smooth" },
 527   { IDS_FLAGS_PROGRESS_BAR_ANIMATION_FAST_START,
 528       switches::kProgressBarAnimation, "fast-start" },
 529 };
 530 #endif  // defined(OS_ANDROID)
 531
 532 #if defined(OS_CHROMEOS)
 533 const Experiment::Choice kCrosRegionsModeChoices[] = {
 534   { IDS_FLAGS_CROS_REGIONS_MODE_DEFAULT, "", "" },
 535   { IDS_FLAGS_CROS_REGIONS_MODE_OVERRIDE, chromeos::switches::kCrosRegionsMode,
 536         chromeos::switches::kCrosRegionsModeOverride },
 537   { IDS_FLAGS_CROS_REGIONS_MODE_HIDE, chromeos::switches::kCrosRegionsMode,
 538         chromeos::switches::kCrosRegionsModeHide },
 539 };
 540 #endif  // defined(OS_CHROMEOS)
 541
 542 // RECORDING USER METRICS FOR FLAGS:
 543 // -----------------------------------------------------------------------------
 544 // The first line of the experiment is the internal name. If you'd like to
 545 // gather statistics about the usage of your flag, you should append a marker
 546 // comment to the end of the feature name, like so:
 547 //   "my-special-feature",  // FLAGS:RECORD_UMA
 548 //
 549 // After doing that, run
 550 //   tools/metrics/actions/extract_actions.py
 551 // to add the metric to actions.xml (which will enable UMA to record your
 552 // feature flag), then update the <owner>s and <description> sections. Make sure
 553 // to include the actions.xml file when you upload your code for review!
 554 //
 555 // After your feature has shipped under a flag, you can locate the metrics under
 556 // the action name AboutFlags_internal-action-name. Actions are recorded once
 557 // per startup, so you should divide this number by AboutFlags_StartupTick to
 558 // get a sense of usage. Note that this will not be the same as number of users
 559 // with a given feature enabled because users can quit and relaunch the
 560 // application multiple times over a given time interval. The dashboard also
 561 // shows you how many (metrics reporting) users have enabled the flag over the
 562 // last seven days. However, note that this is not the same as the number of
 563 // users who have the flag enabled, since enabling the flag happens once,
 564 // whereas running with the flag enabled happens until the user flips the flag
 565 // again.
 566
 567 // To add a new experiment add to the end of kExperiments. There are two
 568 // distinct types of experiments:
 569 // . SINGLE_VALUE: experiment is either on or off. Use the SINGLE_VALUE_TYPE
 570 //   macro for this type supplying the command line to the macro.
 571 // . MULTI_VALUE: a list of choices, the first of which should correspond to a
 572 //   deactivated state for this lab (i.e. no command line option).  To specify
 573 //   this type of experiment use the macro MULTI_VALUE_TYPE supplying it the
 574 //   array of choices.
 575 // See the documentation of Experiment for details on the fields.
 576 //
 577 // Command-line switches must have entries in enum "LoginCustomFlags" in
 578 // histograms.xml. See note in histograms.xml and don't forget to run
 579 // AboutFlagsHistogramTest unit test to calculate and verify checksum.
 580 //
 581 // When adding a new choice, add it to the end of the list.
 582 const Experiment kExperiments[] = {
 583     {"ignore-gpu-blacklist",
 584      IDS_FLAGS_IGNORE_GPU_BLACKLIST_NAME,
 585      IDS_FLAGS_IGNORE_GPU_BLACKLIST_DESCRIPTION,
 586      kOsAll,
 587      SINGLE_VALUE_TYPE(switches::kIgnoreGpuBlacklist)},
 588 #if defined(OS_WIN)
 589     {"disable-direct-write",
 590      IDS_FLAGS_DISABLE_DIRECT_WRITE_NAME,
 591      IDS_FLAGS_DISABLE_DIRECT_WRITE_DESCRIPTION,
 592      kOsWin,
 593      SINGLE_VALUE_TYPE(switches::kDisableDirectWrite)},
 594 #endif
 595     {"enable-experimental-canvas-features",
 596      IDS_FLAGS_ENABLE_EXPERIMENTAL_CANVAS_FEATURES_NAME,
 597      IDS_FLAGS_ENABLE_EXPERIMENTAL_CANVAS_FEATURES_DESCRIPTION,
 598      kOsAll,
 599      SINGLE_VALUE_TYPE(switches::kEnableExperimentalCanvasFeatures)},
 600     {"disable-accelerated-2d-canvas",
 601      IDS_FLAGS_DISABLE_ACCELERATED_2D_CANVAS_NAME,
 602      IDS_FLAGS_DISABLE_ACCELERATED_2D_CANVAS_DESCRIPTION,
 603      kOsAll,
 604      SINGLE_VALUE_TYPE(switches::kDisableAccelerated2dCanvas)},
 605     {"enable-display-list-2d-canvas",
 606      IDS_FLAGS_ENABLE_DISPLAY_LIST_2D_CANVAS_NAME,
 607      IDS_FLAGS_ENABLE_DISPLAY_LIST_2D_CANVAS_DESCRIPTION,
 608      kOsAll,
 609      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableDisplayList2dCanvas,
 610                                switches::kDisableDisplayList2dCanvas)},
 611     {"composited-layer-borders",
 612      IDS_FLAGS_COMPOSITED_LAYER_BORDERS,
 613      IDS_FLAGS_COMPOSITED_LAYER_BORDERS_DESCRIPTION,
 614      kOsAll,
 615      SINGLE_VALUE_TYPE(cc::switches::kShowCompositedLayerBorders)},
 616     {"show-fps-counter",
 617      IDS_FLAGS_SHOW_FPS_COUNTER,
 618      IDS_FLAGS_SHOW_FPS_COUNTER_DESCRIPTION,
 619      kOsAll,
 620      SINGLE_VALUE_TYPE(cc::switches::kShowFPSCounter)},
 621 #if defined(ENABLE_WEBRTC)
 622     {"disable-webrtc-hw-decoding",
 623      IDS_FLAGS_DISABLE_WEBRTC_HW_DECODING_NAME,
 624      IDS_FLAGS_DISABLE_WEBRTC_HW_DECODING_DESCRIPTION,
 625      kOsAndroid | kOsCrOS,
 626      SINGLE_VALUE_TYPE(switches::kDisableWebRtcHWDecoding)},
 627     {"disable-webrtc-hw-encoding",
 628      IDS_FLAGS_DISABLE_WEBRTC_HW_ENCODING_NAME,
 629      IDS_FLAGS_DISABLE_WEBRTC_HW_ENCODING_DESCRIPTION,
 630      kOsAndroid | kOsCrOS,
 631      SINGLE_VALUE_TYPE(switches::kDisableWebRtcHWEncoding)},
 632     {"enable-webrtc-stun-origin",
 633      IDS_FLAGS_ENABLE_WEBRTC_STUN_ORIGIN_NAME,
 634      IDS_FLAGS_ENABLE_WEBRTC_STUN_ORIGIN_DESCRIPTION,
 635      kOsAll,
 636      SINGLE_VALUE_TYPE(switches::kEnableWebRtcStunOrigin)},
 637 #endif
 638 #if defined(OS_ANDROID)
 639     {"disable-webaudio",
 640      IDS_FLAGS_DISABLE_WEBAUDIO_NAME,
 641      IDS_FLAGS_DISABLE_WEBAUDIO_DESCRIPTION,
 642      kOsAndroid,
 643      SINGLE_VALUE_TYPE(switches::kDisableWebAudio)},
 644 #endif
 645   // Native client is compiled out when DISABLE_NACL is defined.
 646 #if !defined(DISABLE_NACL)
 647     {"enable-nacl",  // FLAGS:RECORD_UMA
 648      IDS_FLAGS_ENABLE_NACL_NAME,
 649      IDS_FLAGS_ENABLE_NACL_DESCRIPTION,
 650      kOsAll,
 651      SINGLE_VALUE_TYPE(switches::kEnableNaCl)},
 652     {"enable-nacl-debug",  // FLAGS:RECORD_UMA
 653      IDS_FLAGS_ENABLE_NACL_DEBUG_NAME,
 654      IDS_FLAGS_ENABLE_NACL_DEBUG_DESCRIPTION,
 655      kOsDesktop,
 656      SINGLE_VALUE_TYPE(switches::kEnableNaClDebug)},
 657     {"nacl-debug-mask",  // FLAGS:RECORD_UMA
 658      IDS_FLAGS_NACL_DEBUG_MASK_NAME,
 659      IDS_FLAGS_NACL_DEBUG_MASK_DESCRIPTION,
 660      kOsDesktop,
 661      MULTI_VALUE_TYPE(kNaClDebugMaskChoices)},
 662 #endif
 663 #if defined(ENABLE_EXTENSIONS)
 664     {"extension-apis",  // FLAGS:RECORD_UMA
 665      IDS_FLAGS_EXPERIMENTAL_EXTENSION_APIS_NAME,
 666      IDS_FLAGS_EXPERIMENTAL_EXTENSION_APIS_DESCRIPTION,
 667      kOsDesktop,
 668      SINGLE_VALUE_TYPE(extensions::switches::kEnableExperimentalExtensionApis)},
 669     {"extensions-on-chrome-urls",
 670      IDS_FLAGS_EXTENSIONS_ON_CHROME_URLS_NAME,
 671      IDS_FLAGS_EXTENSIONS_ON_CHROME_URLS_DESCRIPTION,
 672      kOsAll,
 673      SINGLE_VALUE_TYPE(extensions::switches::kExtensionsOnChromeURLs)},
 674 #endif
 675     {"enable-fast-unload",
 676      IDS_FLAGS_ENABLE_FAST_UNLOAD_NAME,
 677      IDS_FLAGS_ENABLE_FAST_UNLOAD_DESCRIPTION,
 678      kOsAll,
 679      SINGLE_VALUE_TYPE(switches::kEnableFastUnload)},
 680 #if defined(ENABLE_EXTENSIONS)
 681     {"enable-app-window-controls",
 682      IDS_FLAGS_ENABLE_APP_WINDOW_CONTROLS_NAME,
 683      IDS_FLAGS_ENABLE_APP_WINDOW_CONTROLS_DESCRIPTION,
 684      kOsDesktop,
 685      SINGLE_VALUE_TYPE(extensions::switches::kEnableAppWindowControls)},
 686 #endif
 687     {"disable-hyperlink-auditing",
 688      IDS_FLAGS_DISABLE_HYPERLINK_AUDITING_NAME,
 689      IDS_FLAGS_DISABLE_HYPERLINK_AUDITING_DESCRIPTION,
 690      kOsAll,
 691      SINGLE_VALUE_TYPE(switches::kNoPings)},
 692 #if defined(OS_ANDROID)
 693     {"contextual-search",
 694      IDS_FLAGS_ENABLE_CONTEXTUAL_SEARCH,
 695      IDS_FLAGS_ENABLE_CONTEXTUAL_SEARCH_DESCRIPTION,
 696      kOsAndroid,
 697      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableContextualSearch,
 698                                switches::kDisableContextualSearch)},
 699 #endif
 700     {"show-autofill-type-predictions",
 701      IDS_FLAGS_SHOW_AUTOFILL_TYPE_PREDICTIONS_NAME,
 702      IDS_FLAGS_SHOW_AUTOFILL_TYPE_PREDICTIONS_DESCRIPTION,
 703      kOsAll,
 704      SINGLE_VALUE_TYPE(autofill::switches::kShowAutofillTypePredictions)},
 705     {"enable-smooth-scrolling",  // FLAGS:RECORD_UMA
 706      IDS_FLAGS_ENABLE_SMOOTH_SCROLLING_NAME,
 707      IDS_FLAGS_ENABLE_SMOOTH_SCROLLING_DESCRIPTION,
 708      // Can't expose the switch unless the code is compiled in.
 709      // On by default for the Mac (different implementation in WebKit).
 710      kOsLinux | kOsWin,
 711      SINGLE_VALUE_TYPE(switches::kEnableSmoothScrolling)},
 712 #if defined(USE_AURA) || defined(OS_LINUX)
 713     {"overlay-scrollbars",
 714      IDS_FLAGS_ENABLE_OVERLAY_SCROLLBARS_NAME,
 715      IDS_FLAGS_ENABLE_OVERLAY_SCROLLBARS_DESCRIPTION,
 716      // Uses the system preference on Mac (a different implementation).
 717      // On Android, this is always enabled.
 718      kOsLinux | kOsCrOS | kOsWin,
 719      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableOverlayScrollbar,
 720                                switches::kDisableOverlayScrollbar)},
 721 #endif
 722     {"enable-panels",
 723      IDS_FLAGS_ENABLE_PANELS_NAME,
 724      IDS_FLAGS_ENABLE_PANELS_DESCRIPTION,
 725      kOsDesktop,
 726      SINGLE_VALUE_TYPE(switches::kEnablePanels)},
 727     {// See http://crbug.com/120416 for how to remove this flag.
 728      "save-page-as-mhtml",  // FLAGS:RECORD_UMA
 729      IDS_FLAGS_SAVE_PAGE_AS_MHTML_NAME,
 730      IDS_FLAGS_SAVE_PAGE_AS_MHTML_DESCRIPTION,
 731      kOsMac | kOsWin | kOsLinux,
 732      SINGLE_VALUE_TYPE(switches::kSavePageAsMHTML)},
 733     {"enable-quic",
 734      IDS_FLAGS_ENABLE_QUIC_NAME,
 735      IDS_FLAGS_ENABLE_QUIC_DESCRIPTION,
 736      kOsAll,
 737      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableQuic, switches::kDisableQuic)},
 738     {"enable-alternative-services",
 739      IDS_FLAGS_ENABLE_ALTSVC_NAME,
 740      IDS_FLAGS_ENABLE_ALTSVC_DESCRIPTION,
 741      kOsAll,
 742      SINGLE_VALUE_TYPE(switches::kEnableAlternativeServices)},
 743     {"disable-media-source",
 744      IDS_FLAGS_DISABLE_MEDIA_SOURCE_NAME,
 745      IDS_FLAGS_DISABLE_MEDIA_SOURCE_DESCRIPTION,
 746      kOsAll,
 747      SINGLE_VALUE_TYPE(switches::kDisableMediaSource)},
 748     {"disable-encrypted-media",
 749      IDS_FLAGS_DISABLE_ENCRYPTED_MEDIA_NAME,
 750      IDS_FLAGS_DISABLE_ENCRYPTED_MEDIA_DESCRIPTION,
 751      kOsAll,
 752      SINGLE_VALUE_TYPE(switches::kDisableEncryptedMedia)},
 753     {"enable-prefixed-encrypted-media",
 754      IDS_FLAGS_ENABLE_PREFIXED_ENCRYPTED_MEDIA_NAME,
 755      IDS_FLAGS_ENABLE_PREFIXED_ENCRYPTED_MEDIA_DESCRIPTION,
 756      kOsAll,
 757      SINGLE_VALUE_TYPE(switches::kEnablePrefixedEncryptedMedia)},
 758     {"disable-javascript-harmony-shipping",
 759      IDS_FLAGS_DISABLE_JAVASCRIPT_HARMONY_SHIPPING_NAME,
 760      IDS_FLAGS_DISABLE_JAVASCRIPT_HARMONY_SHIPPING_DESCRIPTION,
 761      kOsAll,
 762      SINGLE_VALUE_TYPE(switches::kDisableJavaScriptHarmonyShipping)},
 763     {"enable-javascript-harmony",
 764      IDS_FLAGS_ENABLE_JAVASCRIPT_HARMONY_NAME,
 765      IDS_FLAGS_ENABLE_JAVASCRIPT_HARMONY_DESCRIPTION,
 766      kOsAll,
 767      SINGLE_VALUE_TYPE(switches::kJavaScriptHarmony)},
 768     {"disable-software-rasterizer",
 769      IDS_FLAGS_DISABLE_SOFTWARE_RASTERIZER_NAME,
 770      IDS_FLAGS_DISABLE_SOFTWARE_RASTERIZER_DESCRIPTION,
 771 #if defined(ENABLE_SWIFTSHADER)
 772      kOsAll,
 773 #else
 774      0,
 775 #endif
 776      SINGLE_VALUE_TYPE(switches::kDisableSoftwareRasterizer)},
 777     {"enable-gpu-rasterization",
 778      IDS_FLAGS_ENABLE_GPU_RASTERIZATION_NAME,
 779      IDS_FLAGS_ENABLE_GPU_RASTERIZATION_DESCRIPTION,
 780      kOsAll,
 781      MULTI_VALUE_TYPE(kEnableGpuRasterizationChoices)},
 782     {"gpu-rasterization-msaa-sample-count",
 783      IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_NAME,
 784      IDS_FLAGS_GPU_RASTERIZATION_MSAA_SAMPLE_COUNT_DESCRIPTION,
 785      kOsAll,
 786      MULTI_VALUE_TYPE(kGpuRasterizationMSAASampleCountChoices)},
 787      {"enable-slimming-paint-v2",
 788       IDS_FLAGS_ENABLE_SLIMMING_PAINT_V2_NAME,
 789       IDS_FLAGS_ENABLE_SLIMMING_PAINT_V2_DESCRIPTION,
 790       kOsAll,
 791       SINGLE_VALUE_TYPE(switches::kEnableSlimmingPaintV2)},
 792     {"enable-experimental-web-platform-features",
 793      IDS_FLAGS_EXPERIMENTAL_WEB_PLATFORM_FEATURES_NAME,
 794      IDS_FLAGS_EXPERIMENTAL_WEB_PLATFORM_FEATURES_DESCRIPTION,
 795      kOsAll,
 796      SINGLE_VALUE_TYPE(switches::kEnableExperimentalWebPlatformFeatures)},
 797     {"enable-web-bluetooth",
 798      IDS_FLAGS_WEB_BLUETOOTH_NAME,
 799      IDS_FLAGS_WEB_BLUETOOTH_DESCRIPTION,
 800      kOsAll,
 801      SINGLE_VALUE_TYPE(switches::kEnableWebBluetooth)},
 802 #if defined(ENABLE_EXTENSIONS)
 803     {"enable-ble-advertising-in-apps",
 804      IDS_FLAGS_BLE_ADVERTISING_IN_EXTENSIONS_NAME,
 805      IDS_FLAGS_BLE_ADVERTISING_IN_EXTENSIONS_DESCRIPTION,
 806      kOsCrOS,
 807      SINGLE_VALUE_TYPE(extensions::switches::kEnableBLEAdvertising)},
 808 #endif
 809     {"enable-devtools-experiments",
 810      IDS_FLAGS_ENABLE_DEVTOOLS_EXPERIMENTS_NAME,
 811      IDS_FLAGS_ENABLE_DEVTOOLS_EXPERIMENTS_DESCRIPTION,
 812      kOsDesktop,
 813      SINGLE_VALUE_TYPE(switches::kEnableDevToolsExperiments)},
 814     {"silent-debugger-extension-api",
 815      IDS_FLAGS_SILENT_DEBUGGER_EXTENSION_API_NAME,
 816      IDS_FLAGS_SILENT_DEBUGGER_EXTENSION_API_DESCRIPTION,
 817      kOsDesktop,
 818      SINGLE_VALUE_TYPE(switches::kSilentDebuggerExtensionAPI)},
 819 #if defined(ENABLE_SPELLCHECK)
 820 #if defined(OS_ANDROID)
 821     {"enable-android-spellchecker",
 822      IDS_OPTIONS_ENABLE_SPELLCHECK,
 823      IDS_OPTIONS_ENABLE_ANDROID_SPELLCHECKER_DESCRIPTION,
 824      kOsAndroid,
 825      SINGLE_VALUE_TYPE(switches::kEnableAndroidSpellChecker)},
 826 #endif
 827     {"spellcheck-autocorrect",
 828      IDS_FLAGS_SPELLCHECK_AUTOCORRECT,
 829      IDS_FLAGS_SPELLCHECK_AUTOCORRECT_DESCRIPTION,
 830      kOsWin | kOsLinux | kOsCrOS,
 831      SINGLE_VALUE_TYPE(switches::kEnableSpellingAutoCorrect)},
 832 #endif
 833 #if defined(ENABLE_SPELLCHECK) && \
 834     (defined(OS_LINUX) || defined(OS_WIN) || defined(OS_CHROMEOS))
 835     {"enable-multilingual-spellchecker",
 836      IDS_FLAGS_ENABLE_MULTILINGUAL_SPELLCHECKER_NAME,
 837      IDS_FLAGS_ENABLE_MULTILINGUAL_SPELLCHECKER_DESCRIPTION,
 838      kOsWin | kOsLinux | kOsCrOS,
 839      SINGLE_VALUE_TYPE(switches::kEnableMultilingualSpellChecker)},
 840 #endif
 841     {"enable-scroll-prediction",
 842      IDS_FLAGS_ENABLE_SCROLL_PREDICTION_NAME,
 843      IDS_FLAGS_ENABLE_SCROLL_PREDICTION_DESCRIPTION,
 844      kOsDesktop,
 845      SINGLE_VALUE_TYPE(switches::kEnableScrollPrediction)},
 846 #if defined(ENABLE_TOPCHROME_MD)
 847     {"top-chrome-md",
 848      IDS_FLAGS_TOP_CHROME_MD,
 849      IDS_FLAGS_TOP_CHROME_MD_DESCRIPTION,
 850      kOsWin | kOsLinux | kOsCrOS,
 851      MULTI_VALUE_TYPE(kTopChromeMaterialDesignChoices)},
 852 #endif
 853     {"touch-events",
 854      IDS_TOUCH_EVENTS_NAME,
 855      IDS_TOUCH_EVENTS_DESCRIPTION,
 856      kOsDesktop,
 857      MULTI_VALUE_TYPE(kTouchEventsChoices)},
 858     {"disable-touch-adjustment",
 859      IDS_DISABLE_TOUCH_ADJUSTMENT_NAME,
 860      IDS_DISABLE_TOUCH_ADJUSTMENT_DESCRIPTION,
 861      kOsWin | kOsLinux | kOsCrOS | kOsAndroid,
 862      SINGLE_VALUE_TYPE(switches::kDisableTouchAdjustment)},
 863 #if defined(OS_CHROMEOS)
 864     {"network-portal-notification",
 865      IDS_FLAGS_NETWORK_PORTAL_NOTIFICATION_NAME,
 866      IDS_FLAGS_NETWORK_PORTAL_NOTIFICATION_DESCRIPTION,
 867      kOsCrOS,
 868      ENABLE_DISABLE_VALUE_TYPE(
 869          chromeos::switches::kEnableNetworkPortalNotification,
 870          chromeos::switches::kDisableNetworkPortalNotification)},
 871 #endif
 872     {"enable-download-resumption",
 873      IDS_FLAGS_ENABLE_DOWNLOAD_RESUMPTION_NAME,
 874      IDS_FLAGS_ENABLE_DOWNLOAD_RESUMPTION_DESCRIPTION,
 875      kOsDesktop,
 876      SINGLE_VALUE_TYPE(switches::kEnableDownloadResumption)},
 877     {"enable-download-notification",
 878      IDS_FLAGS_ENABLE_DOWNLOAD_NOTIFICATION_NAME,
 879      IDS_FLAGS_ENABLE_DOWNLOAD_NOTIFICATION_DESCRIPTION,
 880      kOsDesktop,
 881      MULTI_VALUE_TYPE(kDownloadNotificationChoices)},
 882 #if defined(ENABLE_PLUGINS)
 883     {"allow-nacl-socket-api",
 884      IDS_FLAGS_ALLOW_NACL_SOCKET_API_NAME,
 885      IDS_FLAGS_ALLOW_NACL_SOCKET_API_DESCRIPTION,
 886      kOsDesktop,
 887      SINGLE_VALUE_TYPE_AND_VALUE(switches::kAllowNaClSocketAPI, "*")},
 888 #endif
 889 #if defined(OS_CHROMEOS)
 890     {"allow-touchpad-three-finger-click",
 891      IDS_FLAGS_ALLOW_TOUCHPAD_THREE_FINGER_CLICK_NAME,
 892      IDS_FLAGS_ALLOW_TOUCHPAD_THREE_FINGER_CLICK_DESCRIPTION,
 893      kOsCrOS,
 894      SINGLE_VALUE_TYPE(chromeos::switches::kEnableTouchpadThreeFingerClick)},
 895     {"ash-enable-unified-desktop",
 896      IDS_FLAGS_ASH_ENABLE_UNIFIED_DESKTOP_NAME,
 897      IDS_FLAGS_ASH_ENABLE_UNIFIED_DESKTOP_DESCRIPTION,
 898      kOsCrOS,
 899      SINGLE_VALUE_TYPE(ash::switches::kAshEnableUnifiedDesktop)},
 900     {"enable-easy-unlock-proximity-detection",
 901      IDS_FLAGS_ENABLE_EASY_UNLOCK_PROXIMITY_DETECTION_NAME,
 902      IDS_FLAGS_ENABLE_EASY_UNLOCK_PROXIMITY_DETECTION_DESCRIPTION,
 903      kOsCrOS,
 904      SINGLE_VALUE_TYPE(proximity_auth::switches::kEnableProximityDetection)},
 905     {"enable-easy-unlock-bluetooth-low-energy-detection",
 906      IDS_FLAGS_ENABLE_EASY_UNLOCK_BLUETOOTH_LOW_ENERGY_DISCOVERY_NAME,
 907      IDS_FLAGS_ENABLE_EASY_UNLOCK_BLUETOOTH_LOW_ENERGY_DISCOVERY_DESCRIPTION,
 908      kOsCrOS,
 909      SINGLE_VALUE_TYPE(
 910          proximity_auth::switches::kEnableBluetoothLowEnergyDiscovery)},
 911 #endif
 912 #if defined(USE_ASH)
 913     {"disable-minimize-on-second-launcher-item-click",
 914      IDS_FLAGS_DISABLE_MINIMIZE_ON_SECOND_LAUNCHER_ITEM_CLICK_NAME,
 915      IDS_FLAGS_DISABLE_MINIMIZE_ON_SECOND_LAUNCHER_ITEM_CLICK_DESCRIPTION,
 916      kOsAll,
 917      SINGLE_VALUE_TYPE(switches::kDisableMinimizeOnSecondLauncherItemClick)},
 918     {"show-touch-hud",
 919      IDS_FLAGS_SHOW_TOUCH_HUD_NAME,
 920      IDS_FLAGS_SHOW_TOUCH_HUD_DESCRIPTION,
 921      kOsAll,
 922      SINGLE_VALUE_TYPE(ash::switches::kAshTouchHud)},
 923     {
 924      "enable-pinch",
 925      IDS_FLAGS_ENABLE_PINCH_SCALE_NAME,
 926      IDS_FLAGS_ENABLE_PINCH_SCALE_DESCRIPTION,
 927      kOsLinux | kOsWin | kOsCrOS,
 928      ENABLE_DISABLE_VALUE_TYPE(switches::kEnablePinch, switches::kDisablePinch),
 929     },
 930 #endif  // defined(USE_ASH)
 931 #if defined(OS_CHROMEOS)
 932     {
 933      "disable-boot-animation",
 934      IDS_FLAGS_DISABLE_BOOT_ANIMATION,
 935      IDS_FLAGS_DISABLE_BOOT_ANIMATION_DESCRIPTION,
 936      kOsCrOSOwnerOnly,
 937      SINGLE_VALUE_TYPE(chromeos::switches::kDisableBootAnimation),
 938     },
 939     {"enable-video-player-chromecast-support",
 940      IDS_FLAGS_ENABLE_VIDEO_PLAYER_CHROMECAST_SUPPORT_NAME,
 941      IDS_FLAGS_ENABLE_VIDEO_PLAYER_CHROMECAST_SUPPORT_DESCRIPTION,
 942      kOsCrOS,
 943      SINGLE_VALUE_TYPE(
 944          chromeos::switches::kEnableVideoPlayerChromecastSupport)},
 945     {
 946      "disable-office-editing-component-app",
 947      IDS_FLAGS_DISABLE_OFFICE_EDITING_COMPONENT_APP_NAME,
 948      IDS_FLAGS_DISABLE_OFFICE_EDITING_COMPONENT_APP_DESCRIPTION,
 949      kOsCrOS,
 950      SINGLE_VALUE_TYPE(chromeos::switches::kDisableOfficeEditingComponentApp),
 951     },
 952     {
 953      "disable-display-color-calibration",
 954      IDS_FLAGS_DISABLE_DISPLAY_COLOR_CALIBRATION_NAME,
 955      IDS_FLAGS_DISABLE_DISPLAY_COLOR_CALIBRATION_DESCRIPTION,
 956      kOsCrOS,
 957      SINGLE_VALUE_TYPE(ui::switches::kDisableDisplayColorCalibration),
 958     },
 959     {
 960      "ash-disable-screen-orientation-lock",
 961      IDS_FLAGS_ASH_DISABLE_SCREEN_ORIENTATION_LOCK_NAME,
 962      IDS_FLAGS_ASH_DISABLE_SCREEN_ORIENTATION_LOCK_DESCRIPTION,
 963      kOsCrOS,
 964      SINGLE_VALUE_TYPE(ash::switches::kAshDisableScreenOrientationLock),
 965     },
 966 #endif  // defined(OS_CHROMEOS)
 967     {
 968      "disable-accelerated-video-decode",
 969      IDS_FLAGS_DISABLE_ACCELERATED_VIDEO_DECODE_NAME,
 970      IDS_FLAGS_DISABLE_ACCELERATED_VIDEO_DECODE_DESCRIPTION,
 971      kOsMac | kOsWin | kOsCrOS,
 972      SINGLE_VALUE_TYPE(switches::kDisableAcceleratedVideoDecode),
 973     },
 974 #if defined(USE_ASH)
 975     {
 976      "ash-debug-shortcuts",
 977      IDS_FLAGS_DEBUG_SHORTCUTS_NAME,
 978      IDS_FLAGS_DEBUG_SHORTCUTS_DESCRIPTION,
 979      kOsAll,
 980      SINGLE_VALUE_TYPE(ash::switches::kAshDebugShortcuts),
 981     },
 982     {
 983      "ash-disable-maximize-mode-window-backdrop",
 984      IDS_FLAGS_ASH_DISABLE_MAXIMIZE_MODE_WINDOW_BACKDROP_NAME,
 985      IDS_FLAGS_ASH_DISABLE_MAXIMIZE_MODE_WINDOW_BACKDROP_DESCRIPTION,
 986      kOsCrOS,
 987      SINGLE_VALUE_TYPE(ash::switches::kAshDisableMaximizeModeWindowBackdrop),
 988     },
 989     {
 990      "ash-enable-touch-view-testing",
 991      IDS_FLAGS_ASH_ENABLE_TOUCH_VIEW_TESTING_NAME,
 992      IDS_FLAGS_ASH_ENABLE_TOUCH_VIEW_TESTING_DESCRIPTION,
 993      kOsCrOS,
 994      SINGLE_VALUE_TYPE(ash::switches::kAshEnableTouchViewTesting),
 995     },
 996     {
 997      "disable-touch-feedback",
 998      IDS_FLAGS_DISABLE_TOUCH_FEEDBACK_NAME,
 999      IDS_FLAGS_DISABLE_TOUCH_FEEDBACK_DESCRIPTION,
1000      kOsCrOS,
1001      SINGLE_VALUE_TYPE(switches::kDisableTouchFeedback),
1002     },
1003     {
1004      "ash-enable-mirrored-screen",
1005      IDS_FLAGS_ASH_ENABLE_MIRRORED_SCREEN_NAME,
1006      IDS_FLAGS_ASH_ENABLE_MIRRORED_SCREEN_DESCRIPTION,
1007      kOsCrOS,
1008      SINGLE_VALUE_TYPE(ash::switches::kAshEnableMirroredScreen),
1009     },
1010     {
1011      "ash-stable-overview-order",
1012      IDS_FLAGS_ASH_STABLE_OVERVIEW_ORDER_NAME,
1013      IDS_FLAGS_ASH_STABLE_OVERVIEW_ORDER_DESCRIPTION,
1014      kOsCrOS,
1015      ENABLE_DISABLE_VALUE_TYPE(ash::switches::kAshEnableStableOverviewOrder,
1016                                ash::switches::kAshDisableStableOverviewOrder),
1017     },
1018 #endif  // defined(USE_ASH)
1019 #if defined(OS_CHROMEOS)
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 #endif
1383     {"enable-zero-copy",
1384      IDS_FLAGS_ENABLE_ZERO_COPY_NAME,
1385      IDS_FLAGS_ENABLE_ZERO_COPY_DESCRIPTION,
1386      kOsAll,
1387      SINGLE_VALUE_TYPE(switches::kEnableZeroCopy)},
1388 #if defined(OS_CHROMEOS)
1389     {"enable-first-run-ui-transitions",
1390      IDS_FLAGS_ENABLE_FIRST_RUN_UI_TRANSITIONS_NAME,
1391      IDS_FLAGS_ENABLE_FIRST_RUN_UI_TRANSITIONS_DESCRIPTION,
1392      kOsCrOS,
1393      SINGLE_VALUE_TYPE(chromeos::switches::kEnableFirstRunUITransitions)},
1394 #endif
1395     {"disable-new-bookmark-apps",
1396      IDS_FLAGS_NEW_BOOKMARK_APPS_NAME,
1397      IDS_FLAGS_NEW_BOOKMARK_APPS_DESCRIPTION,
1398      kOsWin | kOsCrOS | kOsLinux | kOsMac,
1399      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableNewBookmarkApps,
1400                                switches::kDisableNewBookmarkApps)},
1401 #if defined(OS_MACOSX)
1402     {"disable-hosted-apps-in-windows",
1403      IDS_FLAGS_HOSTED_APPS_IN_WINDOWS_NAME,
1404      IDS_FLAGS_HOSTED_APPS_IN_WINDOWS_DESCRIPTION,
1405      kOsMac,
1406      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableHostedAppsInWindows,
1407                                switches::kDisableHostedAppsInWindows)},
1408     {"disable-hosted-app-shim-creation",
1409      IDS_FLAGS_DISABLE_HOSTED_APP_SHIM_CREATION_NAME,
1410      IDS_FLAGS_DISABLE_HOSTED_APP_SHIM_CREATION_DESCRIPTION,
1411      kOsMac,
1412      SINGLE_VALUE_TYPE(switches::kDisableHostedAppShimCreation)},
1413     {"enable-hosted-app-quit-notification",
1414      IDS_FLAGS_ENABLE_HOSTED_APP_QUIT_NOTIFICATION_NAME,
1415      IDS_FLAGS_ENABLE_HOSTED_APP_QUIT_NOTIFICATION_DESCRIPTION,
1416      kOsMac,
1417      SINGLE_VALUE_TYPE(switches::kHostedAppQuitNotification)},
1418 #endif
1419     {"enable-ephemeral-apps-in-webstore",
1420      IDS_FLAGS_ENABLE_EPHEMERAL_APPS_IN_WEBSTORE_NAME,
1421      IDS_FLAGS_ENABLE_EPHEMERAL_APPS_IN_WEBSTORE_DESCRIPTION,
1422      kOsAll,
1423      SINGLE_VALUE_TYPE(switches::kEnableEphemeralAppsInWebstore)},
1424 #if defined(OS_ANDROID)
1425     {"disable-pull-to-refresh-effect",
1426      IDS_FLAGS_DISABLE_PULL_TO_REFRESH_EFFECT_NAME,
1427      IDS_FLAGS_DISABLE_PULL_TO_REFRESH_EFFECT_DESCRIPTION,
1428      kOsAndroid,
1429      SINGLE_VALUE_TYPE(switches::kDisablePullToRefreshEffect)},
1430 #endif
1431 #if defined(OS_MACOSX)
1432     {"enable-translate-new-ux",
1433      IDS_FLAGS_ENABLE_TRANSLATE_NEW_UX_NAME,
1434      IDS_FLAGS_ENABLE_TRANSLATE_NEW_UX_DESCRIPTION,
1435      kOsMac,
1436      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableTranslateNewUX,
1437                                switches::kDisableTranslateNewUX)},
1438 #endif
1439 #if defined(TOOLKIT_VIEWS)
1440     {"disable-views-rect-based-targeting",  // FLAGS:RECORD_UMA
1441      IDS_FLAGS_DISABLE_VIEWS_RECT_BASED_TARGETING_NAME,
1442      IDS_FLAGS_DISABLE_VIEWS_RECT_BASED_TARGETING_DESCRIPTION,
1443      kOsCrOS | kOsWin | kOsLinux,
1444      SINGLE_VALUE_TYPE(views::switches::kDisableViewsRectBasedTargeting)},
1445     {"enable-link-disambiguation-popup",
1446      IDS_FLAGS_ENABLE_LINK_DISAMBIGUATION_POPUP_NAME,
1447      IDS_FLAGS_ENABLE_LINK_DISAMBIGUATION_POPUP_DESCRIPTION,
1448      kOsCrOS | kOsWin,
1449      SINGLE_VALUE_TYPE(switches::kEnableLinkDisambiguationPopup)},
1450 #endif
1451 #if defined(ENABLE_EXTENSIONS)
1452     {"enable-apps-show-on-first-paint",
1453      IDS_FLAGS_ENABLE_APPS_SHOW_ON_FIRST_PAINT_NAME,
1454      IDS_FLAGS_ENABLE_APPS_SHOW_ON_FIRST_PAINT_DESCRIPTION,
1455      kOsDesktop,
1456      SINGLE_VALUE_TYPE(extensions::switches::kEnableAppsShowOnFirstPaint)},
1457 #endif
1458     {"enhanced-bookmarks-experiment",
1459      IDS_FLAGS_ENABLE_ENHANCED_BOOKMARKS_NAME,
1460      IDS_FLAGS_ENABLE_ENHANCED_BOOKMARKS_DESCRIPTION,
1461      kOsDesktop | kOsAndroid,
1462      ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(switches::kEnhancedBookmarksExperiment,
1463                                          "1",
1464                                          switches::kEnhancedBookmarksExperiment,
1465                                          "0")},
1466 #if defined(OS_ANDROID)
1467     {"reader-mode-heuristics",
1468      IDS_FLAGS_READER_MODE_HEURISTICS_NAME,
1469      IDS_FLAGS_READER_MODE_HEURISTICS_DESCRIPTION,
1470      kOsAndroid,
1471      MULTI_VALUE_TYPE(kReaderModeHeuristicsChoices)},
1472     {"enable-dom-distiller-button-animation",
1473      IDS_FLAGS_READER_MODE_BUTTON_ANIMATION,
1474      IDS_FLAGS_READER_MODE_BUTTON_ANIMATION_DESCRIPTION,
1475      kOsAndroid,
1476      SINGLE_VALUE_TYPE(switches::kEnableDomDistillerButtonAnimation)},
1477 #endif
1478     {"num-raster-threads",
1479      IDS_FLAGS_NUM_RASTER_THREADS_NAME,
1480      IDS_FLAGS_NUM_RASTER_THREADS_DESCRIPTION,
1481      kOsAll,
1482      MULTI_VALUE_TYPE(kNumRasterThreadsChoices)},
1483     {"enable-single-click-autofill",
1484      IDS_FLAGS_ENABLE_SINGLE_CLICK_AUTOFILL_NAME,
1485      IDS_FLAGS_ENABLE_SINGLE_CLICK_AUTOFILL_DESCRIPTION,
1486      kOsCrOS | kOsMac | kOsWin | kOsLinux | kOsAndroid,
1487      ENABLE_DISABLE_VALUE_TYPE(
1488          autofill::switches::kEnableSingleClickAutofill,
1489          autofill::switches::kDisableSingleClickAutofill)},
1490     {"enable-site-engagement-service",
1491      IDS_FLAGS_ENABLE_SITE_ENGAGEMENT_SERVICE_NAME,
1492      IDS_FLAGS_ENABLE_SITE_ENGAGEMENT_SERVICE_DESCRIPTION,
1493      kOsAll,
1494      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSiteEngagementService,
1495                                switches::kDisableSiteEngagementService)},
1496     {"enable-session-crashed-bubble",
1497      IDS_FLAGS_ENABLE_SESSION_CRASHED_BUBBLE_NAME,
1498      IDS_FLAGS_ENABLE_SESSION_CRASHED_BUBBLE_DESCRIPTION,
1499      kOsWin | kOsLinux,
1500      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSessionCrashedBubble,
1501                                switches::kDisableSessionCrashedBubble)},
1502     {"enable-pdf-material-ui",
1503      IDS_FLAGS_PDF_MATERIAL_UI_NAME,
1504      IDS_FLAGS_PDF_MATERIAL_UI_DESCRIPTION,
1505      kOsDesktop,
1506      ENABLE_DISABLE_VALUE_TYPE(switches::kEnablePdfMaterialUI,
1507                                switches::kDisablePdfMaterialUI)},
1508     {"disable-cast-streaming-hw-encoding",
1509      IDS_FLAGS_DISABLE_CAST_STREAMING_HW_ENCODING_NAME,
1510      IDS_FLAGS_DISABLE_CAST_STREAMING_HW_ENCODING_DESCRIPTION,
1511      kOsAll,
1512      SINGLE_VALUE_TYPE(switches::kDisableCastStreamingHWEncoding)},
1513 #if defined(OS_ANDROID)
1514     {"prefetch-search-results",
1515      IDS_FLAGS_PREFETCH_SEARCH_RESULTS_NAME,
1516      IDS_FLAGS_PREFETCH_SEARCH_RESULTS_DESCRIPTION,
1517      kOsAndroid,
1518      SINGLE_VALUE_TYPE(switches::kPrefetchSearchResults)},
1519 #endif
1520 #if defined(ENABLE_APP_LIST)
1521     {"enable-experimental-app-list",
1522      IDS_FLAGS_ENABLE_EXPERIMENTAL_APP_LIST_NAME,
1523      IDS_FLAGS_ENABLE_EXPERIMENTAL_APP_LIST_DESCRIPTION,
1524      kOsWin | kOsLinux | kOsCrOS,
1525      ENABLE_DISABLE_VALUE_TYPE(
1526          app_list::switches::kEnableExperimentalAppList,
1527          app_list::switches::kDisableExperimentalAppList)},
1528     {"enable-centered-app-list",
1529      IDS_FLAGS_ENABLE_CENTERED_APP_LIST_NAME,
1530      IDS_FLAGS_ENABLE_CENTERED_APP_LIST_DESCRIPTION,
1531      kOsWin | kOsLinux | kOsCrOS,
1532      SINGLE_VALUE_TYPE(app_list::switches::kEnableCenteredAppList)},
1533     {"enable-new-app-list-mixer",
1534      IDS_FLAGS_ENABLE_NEW_APP_LIST_MIXER_NAME,
1535      IDS_FLAGS_ENABLE_NEW_APP_LIST_MIXER_DESCRIPTION,
1536      kOsWin | kOsLinux | kOsCrOS | kOsMac,
1537      ENABLE_DISABLE_VALUE_TYPE(app_list::switches::kEnableNewAppListMixer,
1538                                app_list::switches::kDisableNewAppListMixer)},
1539 #endif
1540     {"disable-threaded-scrolling",
1541      IDS_FLAGS_DISABLE_THREADED_SCROLLING_NAME,
1542      IDS_FLAGS_DISABLE_THREADED_SCROLLING_DESCRIPTION,
1543      kOsWin | kOsLinux | kOsCrOS | kOsAndroid | kOsMac,
1544      SINGLE_VALUE_TYPE(switches::kDisableThreadedScrolling)},
1545     {"bleeding-edge-renderer-mode",
1546      IDS_FLAGS_BLEEDING_RENDERER_NAME,
1547      IDS_FLAGS_BLEEDING_RENDERER_DESCRIPTION,
1548      kOsAndroid,
1549      SINGLE_VALUE_TYPE(switches::kEnableBleedingEdgeRenderingFastPaths)},
1550     {"enable-settings-window",
1551      IDS_FLAGS_ENABLE_SETTINGS_WINDOW_NAME,
1552      IDS_FLAGS_ENABLE_SETTINGS_WINDOW_DESCRIPTION,
1553      kOsDesktop,
1554      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSettingsWindow,
1555                                switches::kDisableSettingsWindow)},
1556 #if defined(OS_MACOSX)
1557     {"enable-save-password-bubble",
1558      IDS_FLAGS_ENABLE_SAVE_PASSWORD_BUBBLE_NAME,
1559      IDS_FLAGS_ENABLE_SAVE_PASSWORD_BUBBLE_DESCRIPTION,
1560      kOsMac,
1561      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSavePasswordBubble,
1562                                switches::kDisableSavePasswordBubble)},
1563 #endif
1564     {"enable-apps-file-associations",
1565      IDS_FLAGS_ENABLE_APPS_FILE_ASSOCIATIONS_NAME,
1566      IDS_FLAGS_ENABLE_APPS_FILE_ASSOCIATIONS_DESCRIPTION,
1567      kOsMac,
1568      SINGLE_VALUE_TYPE(switches::kEnableAppsFileAssociations)},
1569 #if defined(OS_ANDROID)
1570     {"enable-embeddedsearch-api",
1571      IDS_FLAGS_ENABLE_EMBEDDEDSEARCH_API_NAME,
1572      IDS_FLAGS_ENABLE_EMBEDDEDSEARCH_API_DESCRIPTION,
1573      kOsAndroid,
1574      SINGLE_VALUE_TYPE(switches::kEnableEmbeddedSearchAPI)},
1575 #endif
1576     {"distance-field-text",
1577      IDS_FLAGS_DISTANCE_FIELD_TEXT_NAME,
1578      IDS_FLAGS_DISTANCE_FIELD_TEXT_DESCRIPTION,
1579      kOsAll,
1580      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableDistanceFieldText,
1581                                switches::kDisableDistanceFieldText)},
1582     {"extension-content-verification",
1583      IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_NAME,
1584      IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_DESCRIPTION,
1585      kOsDesktop,
1586      MULTI_VALUE_TYPE(kExtensionContentVerificationChoices)},
1587 #if defined(ENABLE_EXTENSIONS)
1588     {"extension-active-script-permission",
1589      IDS_FLAGS_USER_CONSENT_FOR_EXTENSION_SCRIPTS_NAME,
1590      IDS_FLAGS_USER_CONSENT_FOR_EXTENSION_SCRIPTS_DESCRIPTION,
1591      kOsAll,
1592      SINGLE_VALUE_TYPE(extensions::switches::kEnableScriptsRequireAction)},
1593 #endif
1594 #if defined(OS_ANDROID)
1595     {"enable-data-reduction-proxy-dev",
1596      IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_DEV_NAME,
1597      IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_DEV_DESCRIPTION,
1598      kOsAndroid,
1599      ENABLE_DISABLE_VALUE_TYPE(
1600          data_reduction_proxy::switches::kEnableDataReductionProxyDev,
1601          data_reduction_proxy::switches::kDisableDataReductionProxyDev)},
1602     {"enable-data-reduction-proxy-carrier-test",
1603      IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_CARRIER_TEST_NAME,
1604      IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_CARRIER_TEST_DESCRIPTION,
1605      kOsAndroid,
1606      SINGLE_VALUE_TYPE(
1607          data_reduction_proxy::switches::kEnableDataReductionProxyCarrierTest)},
1608 #endif
1609     {"enable-hotword-hardware",
1610      IDS_FLAGS_ENABLE_EXPERIMENTAL_HOTWORD_HARDWARE_NAME,
1611      IDS_FLAGS_ENABLE_EXPERIMENTAL_HOTWORD_HARDWARE_DESCRIPTION,
1612      kOsCrOS,
1613      SINGLE_VALUE_TYPE(switches::kEnableExperimentalHotwordHardware)},
1614 #if defined(ENABLE_EXTENSIONS)
1615     {"enable-embedded-extension-options",
1616      IDS_FLAGS_ENABLE_EMBEDDED_EXTENSION_OPTIONS_NAME,
1617      IDS_FLAGS_ENABLE_EMBEDDED_EXTENSION_OPTIONS_DESCRIPTION,
1618      kOsDesktop,
1619      SINGLE_VALUE_TYPE(extensions::switches::kEnableEmbeddedExtensionOptions)},
1620 #endif
1621 #if defined(USE_ASH)
1622     {"enable-web-app-frame",
1623      IDS_FLAGS_ENABLE_WEB_APP_FRAME_NAME,
1624      IDS_FLAGS_ENABLE_WEB_APP_FRAME_DESCRIPTION,
1625      kOsWin | kOsCrOS,
1626      SINGLE_VALUE_TYPE(switches::kEnableWebAppFrame)},
1627 #endif
1628     {"enable-drop-sync-credential",
1629      IDS_FLAGS_ENABLE_DROP_SYNC_CREDENTIAL_NAME,
1630      IDS_FLAGS_ENABLE_DROP_SYNC_CREDENTIAL_DESCRIPTION,
1631      kOsAll,
1632      ENABLE_DISABLE_VALUE_TYPE(
1633          password_manager::switches::kEnableDropSyncCredential,
1634          password_manager::switches::kDisableDropSyncCredential)},
1635 #if defined(ENABLE_EXTENSIONS)
1636     {"enable-extension-action-redesign",
1637      IDS_FLAGS_ENABLE_EXTENSION_ACTION_REDESIGN_NAME,
1638      IDS_FLAGS_ENABLE_EXTENSION_ACTION_REDESIGN_DESCRIPTION,
1639      kOsDesktop,
1640      SINGLE_VALUE_TYPE(extensions::switches::kEnableExtensionActionRedesign)},
1641 #endif
1642     {"autofill-sync-credential",
1643      IDS_FLAGS_AUTOFILL_SYNC_CREDENTIAL_NAME,
1644      IDS_FLAGS_AUTOFILL_SYNC_CREDENTIAL_DESCRIPTION,
1645      kOsAll,
1646      MULTI_VALUE_TYPE(kAutofillSyncCredentialChoices)},
1647 #if !defined(OS_ANDROID)
1648     {"enable-message-center-always-scroll-up-upon-notification-removal",
1649      IDS_FLAGS_ENABLE_MESSAGE_CENTER_ALWAYS_SCROLL_UP_UPON_REMOVAL_NAME,
1650      IDS_FLAGS_ENABLE_MESSAGE_CENTER_ALWAYS_SCROLL_UP_UPON_REMOVAL_DESCRIPTION,
1651      kOsDesktop,
1652      SINGLE_VALUE_TYPE(
1653          switches::kEnableMessageCenterAlwaysScrollUpUponNotificationRemoval)},
1654 #endif
1655 #if defined(OS_CHROMEOS)
1656     {"memory-pressure-thresholds",
1657      IDS_FLAGS_MEMORY_PRESSURE_THRESHOLD_NAME,
1658      IDS_FLAGS_MEMORY_PRESSURE_THRESHOLD_DESCRIPTION,
1659      kOsCrOS,
1660      MULTI_VALUE_TYPE(kMemoryPressureThresholdChoices)},
1661     {"wake-on-packets",
1662      IDS_FLAGS_WAKE_ON_PACKETS_NAME,
1663      IDS_FLAGS_WAKE_ON_PACKETS_DESCRIPTION,
1664      kOsCrOSOwnerOnly,
1665      SINGLE_VALUE_TYPE(chromeos::switches::kWakeOnPackets)},
1666 #endif  // OS_CHROMEOS
1667     {"enable-tab-audio-muting",
1668      IDS_FLAGS_ENABLE_TAB_AUDIO_MUTING_NAME,
1669      IDS_FLAGS_ENABLE_TAB_AUDIO_MUTING_DESCRIPTION,
1670      kOsDesktop,
1671      SINGLE_VALUE_TYPE(switches::kEnableTabAudioMuting)},
1672     {"enable-credential-manager-api",
1673      IDS_FLAGS_CREDENTIAL_MANAGER_API_NAME,
1674      IDS_FLAGS_CREDENTIAL_MANAGER_API_DESCRIPTION,
1675      kOsAll,
1676      SINGLE_VALUE_TYPE(switches::kEnableCredentialManagerAPI)},
1677     {"reduced-referrer-granularity",
1678      IDS_FLAGS_REDUCED_REFERRER_GRANULARITY_NAME,
1679      IDS_FLAGS_REDUCED_REFERRER_GRANULARITY_DESCRIPTION,
1680      kOsAll,
1681      SINGLE_VALUE_TYPE(switches::kReducedReferrerGranularity)},
1682 #if defined(ENABLE_PLUGINS)
1683     {"enable-plugin-power-saver",
1684      IDS_FLAGS_ENABLE_PLUGIN_POWER_SAVER_NAME,
1685      IDS_FLAGS_ENABLE_PLUGIN_POWER_SAVER_DESCRIPTION,
1686      kOsDesktop,
1687      ENABLE_DISABLE_VALUE_TYPE(plugins::switches::kEnablePluginPowerSaver,
1688                                plugins::switches::kDisablePluginPowerSaver)},
1689 #endif
1690 #if defined(OS_CHROMEOS)
1691     {"disable-new-zip-unpacker",
1692      IDS_FLAGS_DISABLE_NEW_ZIP_UNPACKER_NAME,
1693      IDS_FLAGS_DISABLE_NEW_ZIP_UNPACKER_DESCRIPTION,
1694      kOsCrOS,
1695      SINGLE_VALUE_TYPE(chromeos::switches::kDisableNewZIPUnpacker)},
1696 #endif  // defined(OS_CHROMEOS)
1697     {"enable-credit-card-scan",
1698      IDS_FLAGS_ENABLE_CREDIT_CARD_SCAN_NAME,
1699      IDS_FLAGS_ENABLE_CREDIT_CARD_SCAN_DESCRIPTION,
1700      kOsAndroid,
1701      ENABLE_DISABLE_VALUE_TYPE(autofill::switches::kEnableCreditCardScan,
1702                                autofill::switches::kDisableCreditCardScan)},
1703 #if defined(OS_CHROMEOS)
1704     {"disable-captive-portal-bypass-proxy",
1705      IDS_FLAGS_DISABLE_CAPTIVE_PORTAL_BYPASS_PROXY_NAME,
1706      IDS_FLAGS_DISABLE_CAPTIVE_PORTAL_BYPASS_PROXY_DESCRIPTION,
1707      kOsCrOS,
1708      SINGLE_VALUE_TYPE(chromeos::switches::kDisableCaptivePortalBypassProxy)},
1709 #endif  // defined(OS_CHROMEOS)
1710 #if defined(OS_ANDROID)
1711     {"enable-seccomp-filter-sandbox",
1712      IDS_FLAGS_ENABLE_SECCOMP_FILTER_SANDBOX_ANDROID_NAME,
1713      IDS_FLAGS_ENABLE_SECCOMP_FILTER_SANDBOX_ANDROID_DESCRIPTION,
1714      kOsAndroid,
1715      SINGLE_VALUE_TYPE(switches::kEnableSeccompFilterSandbox)},
1716 #endif
1717     {"enable-touch-hover",
1718      IDS_FLAGS_ENABLE_TOUCH_HOVER_NAME,
1719      IDS_FLAGS_ENABLE_TOUCH_HOVER_DESCRIPTION,
1720      kOsAndroid,
1721      SINGLE_VALUE_TYPE("enable-touch-hover")},
1722     {"enable-fill-on-account-select",
1723      IDS_FILL_ON_ACCOUNT_SELECT_NAME,
1724      IDS_FILL_ON_ACCOUNT_SELECT_DESCRIPTION,
1725      kOsAll,
1726      MULTI_VALUE_TYPE(kFillOnAccountSelectChoices)},
1727 #if defined(OS_CHROMEOS)
1728     {"enable-wifi-credential-sync",  // FLAGS:RECORD_UMA
1729      IDS_FLAGS_ENABLE_WIFI_CREDENTIAL_SYNC_NAME,
1730      IDS_FLAGS_ENABLE_WIFI_CREDENTIAL_SYNC_DESCRIPTION,
1731      kOsCrOS,
1732      SINGLE_VALUE_TYPE(switches::kEnableWifiCredentialSync)},
1733     {"enable-potentially-annoying-security-features",
1734      IDS_FLAGS_EXPERIMENTAL_SECURITY_FEATURES_NAME,
1735      IDS_FLAGS_EXPERIMENTAL_SECURITY_FEATURES_DESCRIPTION,
1736      kOsAll,
1737      SINGLE_VALUE_TYPE(switches::kEnablePotentiallyAnnoyingSecurityFeatures)},
1738 #endif
1739     {"disable-delay-agnostic-aec",
1740      IDS_FLAGS_DISABLE_DELAY_AGNOSTIC_AEC_NAME,
1741      IDS_FLAGS_DISABLE_DELAY_AGNOSTIC_AEC_DESCRIPTION,
1742      kOsWin | kOsLinux | kOsCrOS,
1743      SINGLE_VALUE_TYPE(switches::kDisableDelayAgnosticAec)},
1744     {"enable-delay-agnostic-aec",
1745      IDS_FLAGS_ENABLE_DELAY_AGNOSTIC_AEC_NAME,
1746      IDS_FLAGS_ENABLE_DELAY_AGNOSTIC_AEC_DESCRIPTION,
1747      kOsMac,
1748      SINGLE_VALUE_TYPE(switches::kEnableDelayAgnosticAec)},
1749     {"mark-non-secure-as",  // FLAGS:RECORD_UMA
1750      IDS_MARK_NON_SECURE_AS_NAME,
1751      IDS_MARK_NON_SECURE_AS_DESCRIPTION,
1752      kOsAll,
1753      MULTI_VALUE_TYPE(kMarkNonSecureAsChoices)},
1754     {"enable-site-per-process",
1755      IDS_FLAGS_ENABLE_SITE_PER_PROCESS_NAME,
1756      IDS_FLAGS_ENABLE_SITE_PER_PROCESS_DESCRIPTION,
1757      kOsAll,
1758      SINGLE_VALUE_TYPE(switches::kSitePerProcess)},
1759 #if defined(OS_MACOSX)
1760     {"enable-harfbuzz-rendertext",
1761      IDS_FLAGS_ENABLE_HARFBUZZ_RENDERTEXT_NAME,
1762      IDS_FLAGS_ENABLE_HARFBUZZ_RENDERTEXT_DESCRIPTION,
1763      kOsMac,
1764      SINGLE_VALUE_TYPE(switches::kEnableHarfBuzzRenderText)},
1765 #endif  // defined(OS_MACOSX)
1766 #if defined(OS_CHROMEOS)
1767     {"disable-timezone-tracking",
1768      IDS_FLAGS_DISABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_NAME,
1769      IDS_FLAGS_DISABLE_RESOLVE_TIMEZONE_BY_GEOLOCATION_DESCRIPTION,
1770      kOsCrOS,
1771      SINGLE_VALUE_TYPE(chromeos::switches::kDisableTimeZoneTrackingOption)},
1772 #endif  // defined(OS_CHROMEOS)
1773     {"data-reduction-proxy-lo-fi",
1774      IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_NAME,
1775      IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_DESCRIPTION,
1776      kOsAll,
1777      MULTI_VALUE_TYPE(kDataReductionProxyLoFiChoices)},
1778     {"clear-data-reduction-proxy-data-savings",
1779      IDS_FLAGS_DATA_REDUCTION_PROXY_RESET_SAVINGS_NAME,
1780      IDS_FLAGS_DATA_REDUCTION_PROXY_RESET_SAVINGS_DESCRIPTION,
1781      kOsAll,
1782      SINGLE_VALUE_TYPE(
1783          data_reduction_proxy::switches::kClearDataReductionProxyDataSavings)},
1784     {"enable-data-reduction-proxy-config-client",
1785      IDS_FLAGS_DATA_REDUCTION_PROXY_CONFIG_CLIENT_NAME,
1786      IDS_FLAGS_DATA_REDUCTION_PROXY_CONFIG_CLIENT_DESCRIPTION,
1787      kOsAll,
1788      SINGLE_VALUE_TYPE(data_reduction_proxy::switches::
1789                            kEnableDataReductionProxyConfigClient)},
1790 #if defined(ENABLE_DATA_REDUCTION_PROXY_DEBUGGING)
1791     {"enable-data-reduction-proxy-bypass-warnings",
1792      IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_BYPASS_WARNING_NAME,
1793      IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_BYPASS_WARNING_DESCRIPTION,
1794      kOsAndroid,
1795      SINGLE_VALUE_TYPE(data_reduction_proxy::switches::
1796                            kEnableDataReductionProxyBypassWarning)},
1797 #endif
1798     {"allow-insecure-localhost",
1799      IDS_ALLOW_INSECURE_LOCALHOST,
1800      IDS_ALLOW_INSECURE_LOCALHOST_DESCRIPTION,
1801      kOsAll,
1802      SINGLE_VALUE_TYPE(switches::kAllowInsecureLocalhost)},
1803     {"enable-add-to-shelf",
1804      IDS_FLAGS_ENABLE_ADD_TO_SHELF_NAME,
1805      IDS_FLAGS_ENABLE_ADD_TO_SHELF_DESCRIPTION,
1806      kOsDesktop,
1807      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAddToShelf,
1808                                switches::kDisableAddToShelf)},
1809     {"bypass-app-banner-engagement-checks",
1810      IDS_FLAGS_BYPASS_APP_BANNER_ENGAGEMENT_CHECKS_NAME,
1811      IDS_FLAGS_BYPASS_APP_BANNER_ENGAGEMENT_CHECKS_DESCRIPTION,
1812      kOsAll,
1813      SINGLE_VALUE_TYPE(switches::kBypassAppBannerEngagementChecks)},
1814     {"use-sync-sandbox",
1815      IDS_FLAGS_SYNC_SANDBOX_NAME,
1816      IDS_FLAGS_SYNC_SANDBOX_DESCRIPTION,
1817      kOsAll,
1818      SINGLE_VALUE_TYPE_AND_VALUE(
1819          switches::kSyncServiceURL,
1820          "https://chrome-sync.sandbox.google.com/chrome-sync/alpha")},
1821     {"enable-child-account-detection",
1822      IDS_FLAGS_CHILD_ACCOUNT_DETECTION_NAME,
1823      IDS_FLAGS_CHILD_ACCOUNT_DETECTION_DESCRIPTION,
1824      kOsAndroid | kOsMac | kOsWin | kOsLinux | kOsCrOS,
1825      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableChildAccountDetection,
1826                                switches::kDisableChildAccountDetection)},
1827 #if defined(OS_CHROMEOS) && defined(USE_OZONE)
1828     {"ozone-test-single-overlay-support",
1829      IDS_FLAGS_OZONE_TEST_SINGLE_HARDWARE_OVERLAY,
1830      IDS_FLAGS_OZONE_TEST_SINGLE_HARDWARE_OVERLAY_DESCRIPTION,
1831      kOsCrOS,
1832      SINGLE_VALUE_TYPE(switches::kOzoneTestSingleOverlaySupport)},
1833 #endif  // defined(OS_CHROMEOS) && defined(USE_OZONE)
1834     {"v8-pac-mojo-out-of-process",
1835      IDS_FLAGS_V8_PAC_MOJO_OUT_OF_PROCESS_NAME,
1836      IDS_FLAGS_V8_PAC_MOJO_OUT_OF_PROCESS_DESCRIPTION,
1837      kOsDesktop,
1838      ENABLE_DISABLE_VALUE_TYPE(switches::kV8PacMojoOutOfProcess,
1839                                switches::kDisableOutOfProcessPac)},
1840 #if defined(ENABLE_MEDIA_ROUTER)
1841     {"enable-media-router",
1842      IDS_FLAGS_ENABLE_MEDIA_ROUTER_NAME,
1843      IDS_FLAGS_ENABLE_MEDIA_ROUTER_DESCRIPTION,
1844      kOsAll,
1845      SINGLE_VALUE_TYPE(switches::kEnableMediaRouter)},
1846 #endif  // defined(ENABLE_MEDIA_ROUTER)
1847 // Since Drive Search is not available when app list is disabled, flag guard
1848 // enable-drive-search-in-chrome-launcher flag.
1849 #if defined(ENABLE_APP_LIST)
1850     {"enable-drive-search-in-app-launcher",
1851      IDS_FLAGS_ENABLE_DRIVE_SEARCH_IN_CHROME_LAUNCHER,
1852      IDS_FLAGS_ENABLE_DRIVE_SEARCH_IN_CHROME_LAUNCHER_DESCRIPTION,
1853      kOsCrOS,
1854      ENABLE_DISABLE_VALUE_TYPE(
1855          app_list::switches::kEnableDriveSearchInChromeLauncher,
1856          app_list::switches::kDisableDriveSearchInChromeLauncher)},
1857 #endif  // defined(ENABLE_APP_LIST)
1858 #if defined(OS_CHROMEOS)
1859     {"disable-mtp-write-support",
1860      IDS_FLAG_DISABLE_MTP_WRITE_SUPPORT_NAME,
1861      IDS_FLAG_DISABLE_MTP_WRITE_SUPPORT_DESCRIPTION,
1862      kOsCrOS,
1863      SINGLE_VALUE_TYPE(chromeos::switches::kDisableMtpWriteSupport)},
1864 #endif  // defined(OS_CHROMEOS)
1865 #if defined(OS_CHROMEOS)
1866     {"enable-datasaver-prompt",
1867      IDS_FLAGS_DATASAVER_PROMPT_NAME,
1868      IDS_FLAGS_DATASAVER_PROMPT_DESCRIPTION,
1869      kOsCrOS,
1870      MULTI_VALUE_TYPE(kDataSaverPromptChoices)},
1871 #endif  // defined(OS_CHROMEOS)
1872     {"supervised-user-safesites",
1873      IDS_FLAGS_SUPERVISED_USER_SAFESITES_NAME,
1874      IDS_FLAGS_SUPERVISED_USER_SAFESITES_DESCRIPTION,
1875      kOsAndroid | kOsMac | kOsWin | kOsLinux | kOsCrOS,
1876      MULTI_VALUE_TYPE(kSupervisedUserSafeSitesChoices)},
1877 #if defined(OS_ANDROID)
1878     {"enable-autofill-keyboard-accessory-view",
1879      IDS_FLAGS_AUTOFILL_ACCESSORY_VIEW_NAME,
1880      IDS_FLAGS_AUTOFILL_ACCESSORY_VIEW_DESCRIPTION,
1881      kOsAndroid,
1882      ENABLE_DISABLE_VALUE_TYPE(
1883          autofill::switches::kEnableAccessorySuggestionView,
1884          autofill::switches::kDisableAccessorySuggestionView)},
1885 #endif  // defined(OS_ANDROID)
1886     // Temporary flag to ease the transition to standard-compliant scrollTop
1887     // behavior.  Will be removed shortly after http://crbug.com/157855 ships.
1888     {"scroll-top-left-interop",
1889      IDS_FLAGS_SCROLL_TOP_LEFT_INTEROP_NAME,
1890      IDS_FLAGS_SCROLL_TOP_LEFT_INTEROP_DESCRIPTION,
1891      kOsAll,
1892      ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(switches::kEnableBlinkFeatures,
1893                                          "ScrollTopLeftInterop",
1894                                          switches::kDisableBlinkFeatures,
1895                                          "ScrollTopLeftInterop")},
1896 #if defined(OS_WIN)
1897     {"try-supported-channel-layouts",
1898      IDS_FLAGS_TRY_SUPPORTED_CHANNEL_LAYOUTS_NAME,
1899      IDS_FLAGS_TRY_SUPPORTED_CHANNEL_LAYOUTS_DESCRIPTION,
1900      kOsWin,
1901      SINGLE_VALUE_TYPE(switches::kTrySupportedChannelLayouts)},
1902 #endif
1903     {"emphasize-titles-in-omnibox-dropdown",
1904      IDS_FLAGS_EMPHASIZE_TITLES_IN_OMNIBOX_DROPDOWN_NAME,
1905      IDS_FLAGS_EMPHASIZE_TITLES_IN_OMNIBOX_DROPDOWN_DESCRIPTION,
1906      kOsAll,
1907      SINGLE_VALUE_TYPE(switches::kEmphasizeTitlesInOmniboxDropdown)},
1908 #if defined(ENABLE_WEBRTC)
1909     {"enable-webrtc-dtls12",
1910      IDS_FLAGS_ENABLE_WEBRTC_DTLS12_NAME,
1911      IDS_FLAGS_ENABLE_WEBRTC_DTLS12_DESCRIPTION,
1912      kOsAll,
1913      SINGLE_VALUE_TYPE(switches::kEnableWebRtcDtls12)},
1914 #endif
1915 #if defined(OS_MACOSX)
1916     {"app-info-dialog",
1917      IDS_FLAGS_APP_INFO_DIALOG_NAME,
1918      IDS_FLAGS_APP_INFO_DIALOG_DESCRIPTION,
1919      kOsMac,
1920      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAppInfoDialogMac,
1921                                switches::kDisableAppInfoDialogMac)},
1922     {"mac-views-native-app-windows",
1923      IDS_FLAGS_MAC_VIEWS_NATIVE_APP_WINDOWS_NAME,
1924      IDS_FLAGS_MAC_VIEWS_NATIVE_APP_WINDOWS_DESCRIPTION,
1925      kOsMac,
1926      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableMacViewsNativeAppWindows,
1927                                switches::kDisableMacViewsNativeAppWindows)},
1928     {"app-window-cycling",
1929      IDS_FLAGS_APP_WINDOW_CYCLING_NAME,
1930      IDS_FLAGS_APP_WINDOW_CYCLING_DESCRIPTION,
1931      kOsMac,
1932      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAppWindowCycling,
1933                                switches::kDisableAppWindowCycling)},
1934     {"mac-views-dialogs",
1935      IDS_FLAGS_MAC_VIEWS_DIALOGS_NAME,
1936      IDS_FLAGS_MAC_VIEWS_DIALOGS_DESCRIPTION,
1937      kOsMac,
1938      SINGLE_VALUE_TYPE(switches::kEnableMacViewsDialogs)},
1939 #endif
1940 #if defined(ENABLE_WEBVR)
1941     {"enable-webvr",
1942      IDS_FLAGS_ENABLE_WEBVR_NAME,
1943      IDS_FLAGS_ENABLE_WEBVR_DESCRIPTION,
1944      kOsAll,
1945      SINGLE_VALUE_TYPE(switches::kEnableWebVR)},
1946 #endif
1947 #if defined(OS_CHROMEOS)
1948     {"disable-accelerated-mjpeg-decode",
1949      IDS_FLAGS_DISABLE_ACCELERATED_MJPEG_DECODE_NAME,
1950      IDS_FLAGS_DISABLE_ACCELERATED_MJPEG_DECODE_DESCRIPTION,
1951      kOsCrOS,
1952      SINGLE_VALUE_TYPE(switches::kDisableAcceleratedMjpegDecode)},
1953 #endif  // OS_CHROMEOS
1954     {"v8-cache-options",
1955      IDS_FLAGS_V8_CACHE_OPTIONS_NAME,
1956      IDS_FLAGS_V8_CACHE_OPTIONS_DESCRIPTION,
1957      kOsAll,
1958      MULTI_VALUE_TYPE(kV8CacheOptionsChoices)},
1959 #if !defined(OS_ANDROID) && !defined(OS_IOS)
1960     {"enable-md-downloads",
1961      IDS_FLAGS_ENABLE_MATERIAL_DESIGN_DOWNLOADS_NAME,
1962      IDS_FLAGS_ENABLE_MATERIAL_DESIGN_DOWNLOADS_DESCRIPTION,
1963      kOsDesktop,
1964      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableMaterialDesignDownloads,
1965                                switches::kDisableMaterialDesignDownloads)},
1966 #endif
1967 #if defined(OS_WIN) || defined(OS_MACOSX)
1968     {"enable-tab-discarding",
1969      IDS_FLAGS_ENABLE_TAB_DISCARDING_NAME,
1970      IDS_FLAGS_ENABLE_TAB_DISCARDING_DESCRIPTION,
1971      kOsWin | kOsMac,
1972      SINGLE_VALUE_TYPE(switches::kEnableTabDiscarding)},
1973 #endif
1974     {"enable-clear-browsing-data-counters",
1975      IDS_FLAGS_ENABLE_CLEAR_BROWSING_DATA_COUNTERS_NAME,
1976      IDS_FLAGS_ENABLE_CLEAR_BROWSING_DATA_COUNTERS_DESCRIPTION,
1977      kOsAll,
1978      SINGLE_VALUE_TYPE(switches::kEnableClearBrowsingDataCounters)
1979     },
1980 #if defined(ENABLE_TASK_MANAGER)
1981     {"disable-new-task-manager",
1982      IDS_FLAGS_DISABLE_NEW_TASK_MANAGER_NAME,
1983      IDS_FLAGS_DISABLE_NEW_TASK_MANAGER_DESCRIPTION,
1984      kOsDesktop,
1985      SINGLE_VALUE_TYPE(switches::kDisableNewTaskManager)
1986     },
1987 #endif  // defined(ENABLE_TASK_MANAGER)
1988     {"simplified-fullscreen-ui",
1989      IDS_FLAGS_SIMPLIFIED_FULLSCREEN_UI_NAME,
1990      IDS_FLAGS_SIMPLIFIED_FULLSCREEN_UI_DESCRIPTION,
1991      kOsDesktop,
1992      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSimplifiedFullscreenUI,
1993                                switches::kDisableSimplifiedFullscreenUI)
1994     },
1995 #if defined(OS_ANDROID)
1996     {"progress-bar-animation",
1997      IDS_FLAGS_PROGRESS_BAR_ANIMATION_NAME,
1998      IDS_FLAGS_PROGRESS_BAR_ANIMATION_DESCRIPTION,
1999      kOsAndroid,
2000      MULTI_VALUE_TYPE(kProgressBarAnimationChoices)},
2001 #endif  // defined(OS_ANDROID)
2002 #if defined(OS_ANDROID)
2003     {"enable-theme-color-in-tabbed-mode",
2004      IDS_FLAGS_THEME_COLOR_IN_TABBED_MODE_NAME,
2005      IDS_FLAGS_THEME_COLOR_IN_TABBED_MODE_DESCRIPTION,
2006      kOsAndroid,
2007      SINGLE_VALUE_TYPE(switches::kEnableThemeColorInTabbedMode)
2008     },
2009 #endif  // defined(OS_ANDROID)
2010 #if defined(OS_ANDROID)
2011     {"offline-pages",
2012      IDS_FLAGS_OFFLINE_PAGES_NAME,
2013      IDS_FLAGS_OFFLINE_PAGES_DESCRIPTION,
2014      kOsAndroid,
2015      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableOfflinePages,
2016                                switches::kDisableOfflinePages)},
2017 #endif  // defined(OS_ANDROID)
2018     {"low-priority-iframes",
2019      IDS_FLAGS_LOW_PRIORITY_IFRAMES_UI_NAME,
2020      IDS_FLAGS_LOW_PRIORITY_IFRAMES_UI_DESCRIPTION,
2021      kOsAll,
2022      // NOTE: if we want to add additional experiment entries for other
2023      // features controlled by kBlinkSettings, we'll need to add logic to
2024      // merge the flag values.
2025      SINGLE_VALUE_TYPE_AND_VALUE(
2026          switches::kBlinkSettings, "lowPriorityIframes=true")},
2027 #if defined(OS_ANDROID)
2028     {"enable-ntp-popular-sites",
2029      IDS_FLAGS_NTP_POPULAR_SITES_NAME,
2030      IDS_FLAGS_NTP_POPULAR_SITES_DESCRIPTION,
2031      kOsAndroid,
2032      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableNTPPopularSites,
2033                                switches::kDisableNTPPopularSites)},
2034     {"use-android-midi-api",
2035      IDS_FLAGS_USE_ANDROID_MIDI_API_NAME,
2036      IDS_FLAGS_USE_ANDROID_MIDI_API_DESCRIPTION,
2037      kOsAndroid,
2038      SINGLE_VALUE_TYPE(switches::kUseAndroidMidiApi)},
2039 #endif  // defined(OS_ANDROID)
2040 #if defined(OS_WIN)
2041      {"trace-export-events-to-etw",
2042       IDS_FLAGS_TRACE_EXPORT_EVENTS_TO_ETW_NAME,
2043       IDS_FLAGS_TRACE_EXPORT_EVENTS_TO_ETW_DESRIPTION,
2044       kOsWin,
2045       SINGLE_VALUE_TYPE(switches::kTraceExportEventsToETW)},
2046 #endif  // defined(OS_WIN)
2047 #if defined(ENABLE_BACKGROUND)
2048     {"enable-push-api-background-mode",
2049      IDS_FLAGS_ENABLE_PUSH_API_BACKGROUND_MODE_NAME,
2050      IDS_FLAGS_ENABLE_PUSH_API_BACKGROUND_MODE_DESCRIPTION,
2051      kOsMac | kOsWin | kOsLinux,
2052      ENABLE_DISABLE_VALUE_TYPE(switches::kEnablePushApiBackgroundMode,
2053                                switches::kDisablePushApiBackgroundMode)},
2054 #endif  // defined(ENABLE_BACKGROUND)
2055 #if !defined(OS_ANDROID) && !defined(OS_IOS)
2056      {"enable-webusb-notifications",
2057       IDS_FLAGS_ENABLE_WEBUSB_NOTIFICATIONS_NAME,
2058       IDS_FLAGS_ENABLE_WEBUSB_NOTIFICATIONS_DESCRIPTION,
2059       kOsDesktop,
2060       SINGLE_VALUE_TYPE(switches::kEnableWebUsbNotifications)},
2061      // TODO(reillyg): Remove this flag when the permission granting UI is
2062      // available. crbug.com/529950
2063      {"enable-webusb-on-any-origin",
2064       IDS_FLAGS_ENABLE_WEBUSB_ON_ANY_ORIGIN_NAME,
2065       IDS_FLAGS_ENABLE_WEBUSB_ON_ANY_ORIGIN_DESCRIPTION,
2066       kOsDesktop,
2067       SINGLE_VALUE_TYPE(switches::kEnableWebUsbOnAnyOrigin)},
2068 #endif
2069 #if defined(OS_CHROMEOS)
2070     {"cros-regions-mode",
2071      IDS_FLAGS_CROS_REGIONS_MODE_NAME,
2072      IDS_FLAGS_CROS_REGIONS_MODE_DESCRIPTION,
2073      kOsCrOS,
2074      MULTI_VALUE_TYPE(kCrosRegionsModeChoices)},
2075 #endif  // OS_CHROMEOS
2076     // NOTE: Adding new command-line switches requires adding corresponding
2077     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
2078     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.
2079 };
2080
2081 const Experiment* experiments = kExperiments;
2082 size_t num_experiments = arraysize(kExperiments);
2083
2084 // Stores and encapsulates the little state that about:flags has.
2085 class FlagsState {
2086  public:
2087   FlagsState() : needs_restart_(false) {}
2088   void ConvertFlagsToSwitches(FlagsStorage* flags_storage,
2089                               base::CommandLine* command_line,
2090                               SentinelsMode sentinels);
2091   bool IsRestartNeededToCommitChanges();
2092   void SetExperimentEnabled(
2093       FlagsStorage* flags_storage,
2094       const std::string& internal_name,
2095       bool enable);
2096   void RemoveFlagsSwitches(
2097       std::map<std::string, base::CommandLine::StringType>* switch_list);
2098   void ResetAllFlags(FlagsStorage* flags_storage);
2099   void reset();
2100
2101   // Returns the singleton instance of this class
2102   static FlagsState* GetInstance() {
2103     return base::Singleton<FlagsState>::get();
2104   }
2105
2106  private:
2107   bool needs_restart_;
2108   std::map<std::string, std::string> flags_switches_;
2109
2110   DISALLOW_COPY_AND_ASSIGN(FlagsState);
2111 };
2112
2113 // Adds the internal names for the specified experiment to |names|.
2114 void AddInternalName(const Experiment& e, std::set<std::string>* names) {
2115   if (e.type == Experiment::SINGLE_VALUE ||
2116       e.type == Experiment::SINGLE_DISABLE_VALUE) {
2117     names->insert(e.internal_name);
2118   } else {
2119     DCHECK(e.type == Experiment::MULTI_VALUE ||
2120            e.type == Experiment::ENABLE_DISABLE_VALUE);
2121     for (int i = 0; i < e.num_choices; ++i)
2122       names->insert(e.NameForChoice(i));
2123   }
2124 }
2125
2126 // Confirms that an experiment is valid, used in a DCHECK in
2127 // SanitizeList below.
2128 bool ValidateExperiment(const Experiment& e) {
2129   switch (e.type) {
2130     case Experiment::SINGLE_VALUE:
2131     case Experiment::SINGLE_DISABLE_VALUE:
2132       DCHECK_EQ(0, e.num_choices);
2133       DCHECK(!e.choices);
2134       break;
2135     case Experiment::MULTI_VALUE:
2136       DCHECK_GT(e.num_choices, 0);
2137       DCHECK(e.choices);
2138       DCHECK(e.choices[0].command_line_switch);
2139       DCHECK_EQ('\0', e.choices[0].command_line_switch[0]);
2140       break;
2141     case Experiment::ENABLE_DISABLE_VALUE:
2142       DCHECK_EQ(3, e.num_choices);
2143       DCHECK(!e.choices);
2144       DCHECK(e.command_line_switch);
2145       DCHECK(e.command_line_value);
2146       DCHECK(e.disable_command_line_switch);
2147       DCHECK(e.disable_command_line_value);
2148       break;
2149     default:
2150       NOTREACHED();
2151   }
2152   return true;
2153 }
2154
2155 // Removes all experiments from prefs::kEnabledLabsExperiments that are
2156 // unknown, to prevent this list to become very long as experiments are added
2157 // and removed.
2158 void SanitizeList(FlagsStorage* flags_storage) {
2159   std::set<std::string> known_experiments;
2160   for (size_t i = 0; i < num_experiments; ++i) {
2161     DCHECK(ValidateExperiment(experiments[i]));
2162     AddInternalName(experiments[i], &known_experiments);
2163   }
2164
2165   std::set<std::string> enabled_experiments = flags_storage->GetFlags();
2166
2167   std::set<std::string> new_enabled_experiments =
2168       base::STLSetIntersection<std::set<std::string> >(
2169           known_experiments, enabled_experiments);
2170
2171   if (new_enabled_experiments != enabled_experiments)
2172     flags_storage->SetFlags(new_enabled_experiments);
2173 }
2174
2175 void GetSanitizedEnabledFlags(
2176     FlagsStorage* flags_storage, std::set<std::string>* result) {
2177   SanitizeList(flags_storage);
2178   *result = flags_storage->GetFlags();
2179 }
2180
2181 bool SkipConditionalExperiment(const Experiment& experiment) {
2182   version_info::Channel channel = chrome::GetChannel();
2183
2184 #if defined(OS_ANDROID)
2185   // enable-data-reduction-proxy-dev is only available for the Dev/Beta channel.
2186   if (!strcmp("enable-data-reduction-proxy-dev", experiment.internal_name) &&
2187       channel != version_info::Channel::BETA &&
2188       channel != version_info::Channel::DEV) {
2189     return true;
2190   }
2191   // enable-data-reduction-proxy-alt is only available for the Dev channel.
2192   if (!strcmp("enable-data-reduction-proxy-alt", experiment.internal_name) &&
2193       channel != version_info::Channel::DEV) {
2194     return true;
2195   }
2196   // enable-data-reduction-proxy-carrier-test is only available for Chromium
2197   // builds and the Canary/Dev channel.
2198   if (!strcmp("enable-data-reduction-proxy-carrier-test",
2199               experiment.internal_name) &&
2200       channel != version_info::Channel::DEV &&
2201       channel != version_info::Channel::CANARY &&
2202       channel != version_info::Channel::UNKNOWN) {
2203     return true;
2204   }
2205 #endif
2206
2207   // data-reduction-proxy-lo-fi is only available for Chromium builds and
2208   // the Canary/Dev/Beta channels.
2209   if (!strcmp("data-reduction-proxy-lo-fi", experiment.internal_name) &&
2210       channel != version_info::Channel::BETA &&
2211       channel != version_info::Channel::DEV &&
2212       channel != version_info::Channel::CANARY &&
2213       channel != version_info::Channel::UNKNOWN) {
2214     return true;
2215   }
2216
2217   // enable-data-reduction-proxy-config-client is only available for Chromium
2218   // builds and the Canary/Dev channels.
2219   if (!strcmp("enable-data-reduction-proxy-config-client",
2220               experiment.internal_name) &&
2221       channel != version_info::Channel::DEV &&
2222       channel != version_info::Channel::CANARY &&
2223       channel != version_info::Channel::UNKNOWN) {
2224     return true;
2225   }
2226
2227 #if defined(ENABLE_DATA_REDUCTION_PROXY_DEBUGGING)
2228   // enable-data-reduction-proxy-bypass-warning is only available for Chromium
2229   // builds and Canary/Dev channel.
2230   if (!strcmp("enable-data-reduction-proxy-bypass-warnings",
2231               experiment.internal_name) &&
2232       channel != version_info::Channel::UNKNOWN &&
2233       channel != version_info::Channel::CANARY &&
2234       channel != version_info::Channel::DEV) {
2235     return true;
2236   }
2237 #endif
2238
2239   return false;
2240 }
2241
2242
2243 // Variant of GetSanitizedEnabledFlags that also removes any flags that aren't
2244 // enabled on the current platform.
2245 void GetSanitizedEnabledFlagsForCurrentPlatform(
2246     FlagsStorage* flags_storage, std::set<std::string>* result) {
2247   GetSanitizedEnabledFlags(flags_storage, result);
2248
2249   // Filter out any experiments that aren't enabled on the current platform.  We
2250   // don't remove these from prefs else syncing to a platform with a different
2251   // set of experiments would be lossy.
2252   std::set<std::string> platform_experiments;
2253   int current_platform = GetCurrentPlatform();
2254   for (size_t i = 0; i < num_experiments; ++i) {
2255     if (experiments[i].supported_platforms & current_platform)
2256       AddInternalName(experiments[i], &platform_experiments);
2257 #if defined(OS_CHROMEOS)
2258     if (experiments[i].supported_platforms & kOsCrOSOwnerOnly)
2259       AddInternalName(experiments[i], &platform_experiments);
2260 #endif
2261   }
2262
2263   std::set<std::string> new_enabled_experiments =
2264       base::STLSetIntersection<std::set<std::string> >(
2265           platform_experiments, *result);
2266
2267   result->swap(new_enabled_experiments);
2268 }
2269
2270 // Returns true if none of this experiment's options have been enabled.
2271 bool IsDefaultValue(
2272     const Experiment& experiment,
2273     const std::set<std::string>& enabled_experiments) {
2274   switch (experiment.type) {
2275     case Experiment::SINGLE_VALUE:
2276     case Experiment::SINGLE_DISABLE_VALUE:
2277       return enabled_experiments.count(experiment.internal_name) == 0;
2278     case Experiment::MULTI_VALUE:
2279     case Experiment::ENABLE_DISABLE_VALUE:
2280       for (int i = 0; i < experiment.num_choices; ++i) {
2281         if (enabled_experiments.count(experiment.NameForChoice(i)) > 0)
2282           return false;
2283       }
2284       break;
2285     default:
2286       NOTREACHED();
2287   }
2288   return true;
2289 }
2290
2291 // Returns the Value representing the choice data in the specified experiment.
2292 base::Value* CreateChoiceData(
2293     const Experiment& experiment,
2294     const std::set<std::string>& enabled_experiments) {
2295   DCHECK(experiment.type == Experiment::MULTI_VALUE ||
2296          experiment.type == Experiment::ENABLE_DISABLE_VALUE);
2297   base::ListValue* result = new base::ListValue;
2298   for (int i = 0; i < experiment.num_choices; ++i) {
2299     base::DictionaryValue* value = new base::DictionaryValue;
2300     const std::string name = experiment.NameForChoice(i);
2301     value->SetString("internal_name", name);
2302     value->SetString("description", experiment.DescriptionForChoice(i));
2303     value->SetBoolean("selected", enabled_experiments.count(name) > 0);
2304     result->Append(value);
2305   }
2306   return result;
2307 }
2308
2309 }  // namespace
2310
2311 std::string Experiment::NameForChoice(int index) const {
2312   DCHECK(type == Experiment::MULTI_VALUE ||
2313          type == Experiment::ENABLE_DISABLE_VALUE);
2314   DCHECK_LT(index, num_choices);
2315   return std::string(internal_name) + testing::kMultiSeparator +
2316          base::IntToString(index);
2317 }
2318
2319 base::string16 Experiment::DescriptionForChoice(int index) const {
2320   DCHECK(type == Experiment::MULTI_VALUE ||
2321          type == Experiment::ENABLE_DISABLE_VALUE);
2322   DCHECK_LT(index, num_choices);
2323   int description_id;
2324   if (type == Experiment::ENABLE_DISABLE_VALUE) {
2325     const int kEnableDisableDescriptionIds[] = {
2326       IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT,
2327       IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
2328       IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
2329     };
2330     description_id = kEnableDisableDescriptionIds[index];
2331   } else {
2332     description_id = choices[index].description_id;
2333   }
2334   return l10n_util::GetStringUTF16(description_id);
2335 }
2336
2337 void ConvertFlagsToSwitches(FlagsStorage* flags_storage,
2338                             base::CommandLine* command_line,
2339                             SentinelsMode sentinels) {
2340   FlagsState::GetInstance()->ConvertFlagsToSwitches(flags_storage,
2341                                                     command_line,
2342                                                     sentinels);
2343 }
2344
2345 bool AreSwitchesIdenticalToCurrentCommandLine(
2346     const base::CommandLine& new_cmdline,
2347     const base::CommandLine& active_cmdline,
2348     std::set<base::CommandLine::StringType>* out_difference) {
2349   std::set<base::CommandLine::StringType> new_flags =
2350       ExtractFlagsFromCommandLine(new_cmdline);
2351   std::set<base::CommandLine::StringType> active_flags =
2352       ExtractFlagsFromCommandLine(active_cmdline);
2353
2354   bool result = false;
2355   // Needed because std::equal doesn't check if the 2nd set is empty.
2356   if (new_flags.size() == active_flags.size()) {
2357     result =
2358         std::equal(new_flags.begin(), new_flags.end(), active_flags.begin());
2359   }
2360
2361   if (out_difference && !result) {
2362     std::set_symmetric_difference(
2363         new_flags.begin(),
2364         new_flags.end(),
2365         active_flags.begin(),
2366         active_flags.end(),
2367         std::inserter(*out_difference, out_difference->begin()));
2368   }
2369
2370   return result;
2371 }
2372
2373 void GetFlagsExperimentsData(FlagsStorage* flags_storage,
2374                              FlagAccess access,
2375                              base::ListValue* supported_experiments,
2376                              base::ListValue* unsupported_experiments) {
2377   std::set<std::string> enabled_experiments;
2378   GetSanitizedEnabledFlags(flags_storage, &enabled_experiments);
2379
2380   int current_platform = GetCurrentPlatform();
2381
2382   for (size_t i = 0; i < num_experiments; ++i) {
2383     const Experiment& experiment = experiments[i];
2384     if (SkipConditionalExperiment(experiment))
2385       continue;
2386
2387     base::DictionaryValue* data = new base::DictionaryValue();
2388     data->SetString("internal_name", experiment.internal_name);
2389     data->SetString("name",
2390                     l10n_util::GetStringUTF16(experiment.visible_name_id));
2391     data->SetString("description",
2392                     l10n_util::GetStringUTF16(
2393                         experiment.visible_description_id));
2394
2395     base::ListValue* supported_platforms = new base::ListValue();
2396     AddOsStrings(experiment.supported_platforms, supported_platforms);
2397     data->Set("supported_platforms", supported_platforms);
2398     // True if the switch is not currently passed.
2399     bool is_default_value = IsDefaultValue(experiment, enabled_experiments);
2400     data->SetBoolean("is_default", is_default_value);
2401
2402     switch (experiment.type) {
2403       case Experiment::SINGLE_VALUE:
2404       case Experiment::SINGLE_DISABLE_VALUE:
2405         data->SetBoolean(
2406             "enabled",
2407             (!is_default_value &&
2408              experiment.type == Experiment::SINGLE_VALUE) ||
2409             (is_default_value &&
2410              experiment.type == Experiment::SINGLE_DISABLE_VALUE));
2411         break;
2412       case Experiment::MULTI_VALUE:
2413       case Experiment::ENABLE_DISABLE_VALUE:
2414         data->Set("choices", CreateChoiceData(experiment, enabled_experiments));
2415         break;
2416       default:
2417         NOTREACHED();
2418     }
2419
2420     bool supported = (experiment.supported_platforms & current_platform) != 0;
2421 #if defined(OS_CHROMEOS)
2422     if (access == kOwnerAccessToFlags &&
2423         (experiment.supported_platforms & kOsCrOSOwnerOnly) != 0) {
2424       supported = true;
2425     }
2426 #endif
2427     if (supported)
2428       supported_experiments->Append(data);
2429     else
2430       unsupported_experiments->Append(data);
2431   }
2432 }
2433
2434 bool IsRestartNeededToCommitChanges() {
2435   return FlagsState::GetInstance()->IsRestartNeededToCommitChanges();
2436 }
2437
2438 void SetExperimentEnabled(FlagsStorage* flags_storage,
2439                           const std::string& internal_name,
2440                           bool enable) {
2441   FlagsState::GetInstance()->SetExperimentEnabled(flags_storage,
2442                                                   internal_name, enable);
2443 }
2444
2445 void RemoveFlagsSwitches(
2446     std::map<std::string, base::CommandLine::StringType>* switch_list) {
2447   FlagsState::GetInstance()->RemoveFlagsSwitches(switch_list);
2448 }
2449
2450 void ResetAllFlags(FlagsStorage* flags_storage) {
2451   FlagsState::GetInstance()->ResetAllFlags(flags_storage);
2452 }
2453
2454 int GetCurrentPlatform() {
2455 #if defined(OS_MACOSX)
2456   return kOsMac;
2457 #elif defined(OS_WIN)
2458   return kOsWin;
2459 #elif defined(OS_CHROMEOS)  // Needs to be before the OS_LINUX check.
2460   return kOsCrOS;
2461 #elif defined(OS_LINUX) || defined(OS_OPENBSD)
2462   return kOsLinux;
2463 #elif defined(OS_ANDROID)
2464   return kOsAndroid;
2465 #else
2466 #error Unknown platform
2467 #endif
2468 }
2469
2470 void RecordUMAStatistics(FlagsStorage* flags_storage) {
2471   std::set<std::string> flags = flags_storage->GetFlags();
2472   for (const std::string& flag : flags) {
2473     std::string action("AboutFlags_");
2474     action += flag;
2475     content::RecordComputedAction(action);
2476   }
2477   // Since flag metrics are recorded every startup, add a tick so that the
2478   // stats can be made meaningful.
2479   if (flags.size())
2480     content::RecordAction(base::UserMetricsAction("AboutFlags_StartupTick"));
2481   content::RecordAction(base::UserMetricsAction("StartupTick"));
2482 }
2483
2484 base::HistogramBase::Sample GetSwitchUMAId(const std::string& switch_name) {
2485   return static_cast<base::HistogramBase::Sample>(
2486       metrics::HashMetricName(switch_name));
2487 }
2488
2489 void ReportCustomFlags(const std::string& uma_histogram_hame,
2490                        const std::set<std::string>& command_line_difference) {
2491   for (const std::string& flag : command_line_difference) {
2492     int uma_id = about_flags::testing::kBadSwitchFormatHistogramId;
2493     if (base::StartsWith(flag, "--", base::CompareCase::SENSITIVE)) {
2494       // Skip '--' before switch name.
2495       std::string switch_name(flag.substr(2));
2496
2497       // Kill value, if any.
2498       const size_t value_pos = switch_name.find('=');
2499       if (value_pos != std::string::npos)
2500         switch_name.resize(value_pos);
2501
2502       uma_id = GetSwitchUMAId(switch_name);
2503     } else {
2504       NOTREACHED() << "ReportCustomFlags(): flag '" << flag
2505                    << "' has incorrect format.";
2506     }
2507     DVLOG(1) << "ReportCustomFlags(): histogram='" << uma_histogram_hame
2508              << "' '" << flag << "', uma_id=" << uma_id;
2509
2510     // Sparse histogram macro does not cache the histogram, so it's safe
2511     // to use macro with non-static histogram name here.
2512     UMA_HISTOGRAM_SPARSE_SLOWLY(uma_histogram_hame, uma_id);
2513   }
2514 }
2515
2516 //////////////////////////////////////////////////////////////////////////////
2517 // FlagsState implementation.
2518
2519 namespace {
2520
2521 typedef std::map<std::string, std::pair<std::string, std::string> >
2522     NameToSwitchAndValueMap;
2523
2524 void SetFlagToSwitchMapping(const std::string& key,
2525                             const std::string& switch_name,
2526                             const std::string& switch_value,
2527                             NameToSwitchAndValueMap* name_to_switch_map) {
2528   DCHECK(name_to_switch_map->end() == name_to_switch_map->find(key));
2529   (*name_to_switch_map)[key] = std::make_pair(switch_name, switch_value);
2530 }
2531
2532 void FlagsState::ConvertFlagsToSwitches(FlagsStorage* flags_storage,
2533                                         base::CommandLine* command_line,
2534                                         SentinelsMode sentinels) {
2535   if (command_line->HasSwitch(switches::kNoExperiments))
2536     return;
2537
2538   std::set<std::string> enabled_experiments;
2539
2540   GetSanitizedEnabledFlagsForCurrentPlatform(flags_storage,
2541                                              &enabled_experiments);
2542
2543   NameToSwitchAndValueMap name_to_switch_map;
2544   for (size_t i = 0; i < num_experiments; ++i) {
2545     const Experiment& e = experiments[i];
2546     if (e.type == Experiment::SINGLE_VALUE ||
2547         e.type == Experiment::SINGLE_DISABLE_VALUE) {
2548       SetFlagToSwitchMapping(e.internal_name, e.command_line_switch,
2549                              e.command_line_value, &name_to_switch_map);
2550     } else if (e.type == Experiment::MULTI_VALUE) {
2551       for (int j = 0; j < e.num_choices; ++j) {
2552         SetFlagToSwitchMapping(e.NameForChoice(j),
2553                                e.choices[j].command_line_switch,
2554                                e.choices[j].command_line_value,
2555                                &name_to_switch_map);
2556       }
2557     } else {
2558       DCHECK_EQ(e.type, Experiment::ENABLE_DISABLE_VALUE);
2559       SetFlagToSwitchMapping(e.NameForChoice(0), std::string(), std::string(),
2560                              &name_to_switch_map);
2561       SetFlagToSwitchMapping(e.NameForChoice(1), e.command_line_switch,
2562                              e.command_line_value, &name_to_switch_map);
2563       SetFlagToSwitchMapping(e.NameForChoice(2), e.disable_command_line_switch,
2564                              e.disable_command_line_value, &name_to_switch_map);
2565     }
2566   }
2567
2568   if (sentinels == kAddSentinels) {
2569     command_line->AppendSwitch(switches::kFlagSwitchesBegin);
2570     flags_switches_.insert(
2571         std::pair<std::string, std::string>(switches::kFlagSwitchesBegin,
2572                                             std::string()));
2573   }
2574   for (const std::string& experiment_name : enabled_experiments) {
2575     NameToSwitchAndValueMap::const_iterator name_to_switch_it =
2576         name_to_switch_map.find(experiment_name);
2577     if (name_to_switch_it == name_to_switch_map.end()) {
2578       NOTREACHED();
2579       continue;
2580     }
2581
2582     const std::pair<std::string, std::string>&
2583         switch_and_value_pair = name_to_switch_it->second;
2584
2585     CHECK(!switch_and_value_pair.first.empty());
2586     command_line->AppendSwitchASCII(switch_and_value_pair.first,
2587                                     switch_and_value_pair.second);
2588     flags_switches_[switch_and_value_pair.first] = switch_and_value_pair.second;
2589   }
2590   if (sentinels == kAddSentinels) {
2591     command_line->AppendSwitch(switches::kFlagSwitchesEnd);
2592     flags_switches_.insert(
2593         std::pair<std::string, std::string>(switches::kFlagSwitchesEnd,
2594                                             std::string()));
2595   }
2596 }
2597
2598 bool FlagsState::IsRestartNeededToCommitChanges() {
2599   return needs_restart_;
2600 }
2601
2602 void FlagsState::SetExperimentEnabled(FlagsStorage* flags_storage,
2603                                       const std::string& internal_name,
2604                                       bool enable) {
2605   size_t at_index = internal_name.find(testing::kMultiSeparator);
2606   if (at_index != std::string::npos) {
2607     DCHECK(enable);
2608     // We're being asked to enable a multi-choice experiment. Disable the
2609     // currently selected choice.
2610     DCHECK_NE(at_index, 0u);
2611     const std::string experiment_name = internal_name.substr(0, at_index);
2612     SetExperimentEnabled(flags_storage, experiment_name, false);
2613
2614     // And enable the new choice, if it is not the default first choice.
2615     if (internal_name != experiment_name + "@0") {
2616       std::set<std::string> enabled_experiments;
2617       GetSanitizedEnabledFlags(flags_storage, &enabled_experiments);
2618       needs_restart_ |= enabled_experiments.insert(internal_name).second;
2619       flags_storage->SetFlags(enabled_experiments);
2620     }
2621     return;
2622   }
2623
2624   std::set<std::string> enabled_experiments;
2625   GetSanitizedEnabledFlags(flags_storage, &enabled_experiments);
2626
2627   const Experiment* e = NULL;
2628   for (size_t i = 0; i < num_experiments; ++i) {
2629     if (experiments[i].internal_name == internal_name) {
2630       e = experiments + i;
2631       break;
2632     }
2633   }
2634   DCHECK(e);
2635
2636   if (e->type == Experiment::SINGLE_VALUE) {
2637     if (enable)
2638       needs_restart_ |= enabled_experiments.insert(internal_name).second;
2639     else
2640       needs_restart_ |= (enabled_experiments.erase(internal_name) > 0);
2641   } else if (e->type == Experiment::SINGLE_DISABLE_VALUE) {
2642     if (!enable)
2643       needs_restart_ |= enabled_experiments.insert(internal_name).second;
2644     else
2645       needs_restart_ |= (enabled_experiments.erase(internal_name) > 0);
2646   } else {
2647     if (enable) {
2648       // Enable the first choice.
2649       needs_restart_ |= enabled_experiments.insert(e->NameForChoice(0)).second;
2650     } else {
2651       // Find the currently enabled choice and disable it.
2652       for (int i = 0; i < e->num_choices; ++i) {
2653         std::string choice_name = e->NameForChoice(i);
2654         if (enabled_experiments.find(choice_name) !=
2655             enabled_experiments.end()) {
2656           needs_restart_ = true;
2657           enabled_experiments.erase(choice_name);
2658           // Continue on just in case there's a bug and more than one
2659           // experiment for this choice was enabled.
2660         }
2661       }
2662     }
2663   }
2664
2665   flags_storage->SetFlags(enabled_experiments);
2666 }
2667
2668 void FlagsState::RemoveFlagsSwitches(
2669     std::map<std::string, base::CommandLine::StringType>* switch_list) {
2670   for (const auto& entry : flags_switches_)
2671     switch_list->erase(entry.first);
2672 }
2673
2674 void FlagsState::ResetAllFlags(FlagsStorage* flags_storage) {
2675   needs_restart_ = true;
2676
2677   std::set<std::string> no_experiments;
2678   flags_storage->SetFlags(no_experiments);
2679 }
2680
2681 void FlagsState::reset() {
2682   needs_restart_ = false;
2683   flags_switches_.clear();
2684 }
2685
2686 }  // namespace
2687
2688 namespace testing {
2689
2690 // WARNING: '@' is also used in the html file. If you update this constant you
2691 // also need to update the html file.
2692 const char kMultiSeparator[] = "@";
2693
2694 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
2695
2696 void ClearState() {
2697   FlagsState::GetInstance()->reset();
2698 }
2699
2700 void SetExperiments(const Experiment* e, size_t count) {
2701   if (!e) {
2702     experiments = kExperiments;
2703     num_experiments = arraysize(kExperiments);
2704   } else {
2705     experiments = e;
2706     num_experiments = count;
2707   }
2708 }
2709
2710 const Experiment* GetExperiments(size_t* count) {
2711   *count = num_experiments;
2712   return experiments;
2713 }
2714
2715 }  // namespace testing
2716
2717 }  // namespace about_flags