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/stl_util.h"
  15 #include "base/strings/string_number_conversions.h"
  16 #include "base/strings/utf_string_conversions.h"
  17 #include "base/values.h"
  18 #include "cc/base/switches.h"
  19 #include "chrome/browser/bookmarks/enhanced_bookmarks_features.h"
  20 #include "chrome/browser/flags_storage.h"
  21 #include "chrome/common/chrome_content_client.h"
  22 #include "chrome/common/chrome_switches.h"
  23 #include "components/autofill/core/common/autofill_switches.h"
  24 #include "components/cloud_devices/common/cloud_devices_switches.h"
  25 #include "components/nacl/common/nacl_switches.h"
  26 #include "components/search/search_switches.h"
  27 #include "content/public/browser/user_metrics.h"
  28 #include "extensions/common/switches.h"
  29 #include "grit/chromium_strings.h"
  30 #include "grit/generated_resources.h"
  31 #include "grit/google_chrome_strings.h"
  32 #include "media/base/media_switches.h"
  33 #include "ui/base/l10n/l10n_util.h"
  34 #include "ui/base/ui_base_switches.h"
  35 #include "ui/display/display_switches.h"
  36 #include "ui/events/event_switches.h"
  37 #include "ui/gfx/switches.h"
  38 #include "ui/gl/gl_switches.h"
  39 #include "ui/keyboard/keyboard_switches.h"
  40 #include "ui/native_theme/native_theme_switches.h"
  41 #include "ui/views/views_switches.h"
  42
  43 #if defined(OS_ANDROID)
  44 #include "chrome/common/chrome_version_info.h"
  45 #include "components/data_reduction_proxy/common/data_reduction_proxy_switches.h"
  46 #endif
  47
  48 #if defined(USE_ASH)
  49 #include "ash/ash_switches.h"
  50 #endif
  51
  52 #if defined(OS_CHROMEOS)
  53 #include "chromeos/chromeos_switches.h"
  54 #include "third_party/cros_system_api/switches/chrome_switches.h"
  55 #endif
  56
  57 #if defined(ENABLE_APP_LIST)
  58 #include "ui/app_list/app_list_switches.h"
  59 #endif
  60
  61 using base::UserMetricsAction;
  62
  63 namespace about_flags {
  64
  65 // Macros to simplify specifying the type.
  66 #define SINGLE_VALUE_TYPE_AND_VALUE(command_line_switch, switch_value) \
  67     Experiment::SINGLE_VALUE, \
  68     command_line_switch, switch_value, NULL, NULL, NULL, 0
  69 #define SINGLE_VALUE_TYPE(command_line_switch) \
  70     SINGLE_VALUE_TYPE_AND_VALUE(command_line_switch, "")
  71 #define ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(enable_switch, enable_value, \
  72                                             disable_switch, disable_value) \
  73     Experiment::ENABLE_DISABLE_VALUE, enable_switch, enable_value, \
  74     disable_switch, disable_value, NULL, 3
  75 #define ENABLE_DISABLE_VALUE_TYPE(enable_switch, disable_switch) \
  76     ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(enable_switch, "", disable_switch, "")
  77 #define MULTI_VALUE_TYPE(choices) \
  78     Experiment::MULTI_VALUE, NULL, NULL, NULL, NULL, choices, arraysize(choices)
  79
  80 namespace {
  81
  82 const unsigned kOsAll = kOsMac | kOsWin | kOsLinux | kOsCrOS | kOsAndroid;
  83 const unsigned kOsDesktop = kOsMac | kOsWin | kOsLinux | kOsCrOS;
  84
  85 // Adds a |StringValue| to |list| for each platform where |bitmask| indicates
  86 // whether the experiment is available on that platform.
  87 void AddOsStrings(unsigned bitmask, base::ListValue* list) {
  88   struct {
  89     unsigned bit;
  90     const char* const name;
  91   } kBitsToOs[] = {
  92     {kOsMac, "Mac"},
  93     {kOsWin, "Windows"},
  94     {kOsLinux, "Linux"},
  95     {kOsCrOS, "Chrome OS"},
  96     {kOsAndroid, "Android"},
  97     {kOsCrOSOwnerOnly, "Chrome OS (owner only)"},
  98   };
  99   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kBitsToOs); ++i)
 100     if (bitmask & kBitsToOs[i].bit)
 101       list->Append(new base::StringValue(kBitsToOs[i].name));
 102 }
 103
 104 // Convert switch constants to proper CommandLine::StringType strings.
 105 CommandLine::StringType GetSwitchString(const std::string& flag) {
 106   CommandLine cmd_line(CommandLine::NO_PROGRAM);
 107   cmd_line.AppendSwitch(flag);
 108   DCHECK_EQ(2U, cmd_line.argv().size());
 109   return cmd_line.argv()[1];
 110 }
 111
 112 // Scoops flags from a command line.
 113 std::set<CommandLine::StringType> ExtractFlagsFromCommandLine(
 114     const CommandLine& cmdline) {
 115   std::set<CommandLine::StringType> flags;
 116   // First do the ones between --flag-switches-begin and --flag-switches-end.
 117   CommandLine::StringVector::const_iterator first =
 118       std::find(cmdline.argv().begin(), cmdline.argv().end(),
 119                 GetSwitchString(switches::kFlagSwitchesBegin));
 120   CommandLine::StringVector::const_iterator last =
 121       std::find(cmdline.argv().begin(), cmdline.argv().end(),
 122                 GetSwitchString(switches::kFlagSwitchesEnd));
 123   if (first != cmdline.argv().end() && last != cmdline.argv().end())
 124     flags.insert(first + 1, last);
 125 #if defined(OS_CHROMEOS)
 126   // Then add those between --policy-switches-begin and --policy-switches-end.
 127   first = std::find(cmdline.argv().begin(), cmdline.argv().end(),
 128                     GetSwitchString(chromeos::switches::kPolicySwitchesBegin));
 129   last = std::find(cmdline.argv().begin(), cmdline.argv().end(),
 130                    GetSwitchString(chromeos::switches::kPolicySwitchesEnd));
 131   if (first != cmdline.argv().end() && last != cmdline.argv().end())
 132     flags.insert(first + 1, last);
 133 #endif
 134   return flags;
 135 }
 136
 137 const Experiment::Choice kEnableCompositingForFixedPositionChoices[] = {
 138   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 139   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 140     switches::kEnableCompositingForFixedPosition, ""},
 141   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 142     switches::kDisableCompositingForFixedPosition, ""},
 143   { IDS_FLAGS_COMPOSITING_FOR_FIXED_POSITION_HIGH_DPI,
 144     switches::kEnableHighDpiCompositingForFixedPosition, ""}
 145 };
 146
 147 const Experiment::Choice kEnableCompositingForTransitionChoices[] = {
 148   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 149   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 150     switches::kEnableCompositingForTransition, ""},
 151   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 152     switches::kDisableCompositingForTransition, ""},
 153 };
 154
 155 const Experiment::Choice kEnableAcceleratedFixedRootBackgroundChoices[] = {
 156   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 157   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 158     switches::kEnableAcceleratedFixedRootBackground, ""},
 159   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 160     switches::kDisableAcceleratedFixedRootBackground, ""},
 161 };
 162
 163 const Experiment::Choice kTouchEventsChoices[] = {
 164   { IDS_GENERIC_EXPERIMENT_CHOICE_AUTOMATIC, "", "" },
 165   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 166     switches::kTouchEvents,
 167     switches::kTouchEventsEnabled },
 168   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 169     switches::kTouchEvents,
 170     switches::kTouchEventsDisabled }
 171 };
 172
 173 #if defined(USE_AURA)
 174 const Experiment::Choice kOverscrollHistoryNavigationChoices[] = {
 175   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED, "", "" },
 176   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 177     switches::kOverscrollHistoryNavigation,
 178     "0" },
 179   { IDS_OVERSCROLL_HISTORY_NAVIGATION_SIMPLE_UI,
 180     switches::kOverscrollHistoryNavigation,
 181     "2" }
 182 };
 183 #endif
 184 #if defined(OS_CHROMEOS) || defined(OS_WIN) || defined(OS_LINUX)
 185 const Experiment::Choice kDeviceScaleFactorChoices[] = {
 186   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
 187   { IDS_DEVICE_SCALE_FACTOR_1_1, switches::kForceDeviceScaleFactor, "1.1"},
 188   { IDS_DEVICE_SCALE_FACTOR_1_2, switches::kForceDeviceScaleFactor, "1.2"},
 189   { IDS_DEVICE_SCALE_FACTOR_1_25, switches::kForceDeviceScaleFactor, "1.25"},
 190   { IDS_DEVICE_SCALE_FACTOR_1_3, switches::kForceDeviceScaleFactor, "1.3"},
 191   { IDS_DEVICE_SCALE_FACTOR_1_4, switches::kForceDeviceScaleFactor, "1.4"},
 192   { IDS_DEVICE_SCALE_FACTOR_2, switches::kForceDeviceScaleFactor, "2"},
 193 };
 194 #endif
 195
 196 #if !defined(DISABLE_NACL)
 197 const Experiment::Choice kNaClDebugMaskChoices[] = {
 198   // Secure shell can be used on ChromeOS for forwarding the TCP port opened by
 199   // debug stub to a remote machine. Since secure shell uses NaCl, we usually
 200   // want to avoid debugging that. The PNaCl translator is also a NaCl module,
 201   // so by default we want to avoid debugging that.
 202   // NOTE: As the default value must be the empty string, the mask excluding
 203   // the PNaCl translator and secure shell is substituted elsewhere.
 204   { IDS_NACL_DEBUG_MASK_CHOICE_EXCLUDE_UTILS_PNACL, "", "" },
 205   { IDS_NACL_DEBUG_MASK_CHOICE_DEBUG_ALL, switches::kNaClDebugMask, "*://*" },
 206   { IDS_NACL_DEBUG_MASK_CHOICE_INCLUDE_DEBUG,
 207       switches::kNaClDebugMask, "*://*/*debug.nmf" }
 208 };
 209 #endif
 210
 211 const Experiment::Choice kImplSidePaintingChoices[] = {
 212   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 213   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 214     switches::kEnableImplSidePainting, ""},
 215   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 216     switches::kDisableImplSidePainting, ""}
 217 };
 218
 219 const Experiment::Choice kLCDTextChoices[] = {
 220   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 221   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED, switches::kEnableLCDText, ""},
 222   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED, switches::kDisableLCDText, ""}
 223 };
 224
 225 const Experiment::Choice kDistanceFieldTextChoices[] = {
 226   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 227   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 228     switches::kEnableDistanceFieldText, "" },
 229   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 230     switches::kDisableDistanceFieldText, "" }
 231 };
 232
 233 #ifndef USE_AURA
 234 const Experiment::Choice kDelegatedRendererChoices[] = {
 235   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 236   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 237     switches::kEnableDelegatedRenderer, ""},
 238   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 239     switches::kDisableDelegatedRenderer, ""}
 240 };
 241 #endif
 242
 243 const Experiment::Choice kMaxTilesForInterestAreaChoices[] = {
 244   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 245   { IDS_FLAGS_MAX_TILES_FOR_INTEREST_AREA_SHORT,
 246     cc::switches::kMaxTilesForInterestArea, "64"},
 247   { IDS_FLAGS_MAX_TILES_FOR_INTEREST_AREA_TALL,
 248     cc::switches::kMaxTilesForInterestArea, "128"},
 249   { IDS_FLAGS_MAX_TILES_FOR_INTEREST_AREA_GRANDE,
 250     cc::switches::kMaxTilesForInterestArea, "256"},
 251   { IDS_FLAGS_MAX_TILES_FOR_INTEREST_AREA_VENTI,
 252     cc::switches::kMaxTilesForInterestArea, "512"}
 253 };
 254
 255 const Experiment::Choice kDefaultTileWidthChoices[] = {
 256   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 257   { IDS_FLAGS_DEFAULT_TILE_WIDTH_SHORT,
 258     switches::kDefaultTileWidth, "128"},
 259   { IDS_FLAGS_DEFAULT_TILE_WIDTH_TALL,
 260     switches::kDefaultTileWidth, "256"},
 261   { IDS_FLAGS_DEFAULT_TILE_WIDTH_GRANDE,
 262     switches::kDefaultTileWidth, "512"},
 263   { IDS_FLAGS_DEFAULT_TILE_WIDTH_VENTI,
 264     switches::kDefaultTileWidth, "1024"}
 265 };
 266
 267 const Experiment::Choice kDefaultTileHeightChoices[] = {
 268   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 269   { IDS_FLAGS_DEFAULT_TILE_HEIGHT_SHORT,
 270     switches::kDefaultTileHeight, "128"},
 271   { IDS_FLAGS_DEFAULT_TILE_HEIGHT_TALL,
 272     switches::kDefaultTileHeight, "256"},
 273   { IDS_FLAGS_DEFAULT_TILE_HEIGHT_GRANDE,
 274     switches::kDefaultTileHeight, "512"},
 275   { IDS_FLAGS_DEFAULT_TILE_HEIGHT_VENTI,
 276     switches::kDefaultTileHeight, "1024"}
 277 };
 278
 279 const Experiment::Choice kSimpleCacheBackendChoices[] = {
 280   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 281   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 282     switches::kUseSimpleCacheBackend, "off" },
 283   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 284     switches::kUseSimpleCacheBackend, "on"}
 285 };
 286
 287 #if defined(USE_AURA)
 288 const Experiment::Choice kTabCaptureUpscaleQualityChoices[] = {
 289   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 290   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_FAST,
 291     switches::kTabCaptureUpscaleQuality, "fast" },
 292   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_GOOD,
 293     switches::kTabCaptureUpscaleQuality, "good" },
 294   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_BEST,
 295     switches::kTabCaptureUpscaleQuality, "best" },
 296 };
 297
 298 const Experiment::Choice kTabCaptureDownscaleQualityChoices[] = {
 299   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 300   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_FAST,
 301     switches::kTabCaptureDownscaleQuality, "fast" },
 302   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_GOOD,
 303     switches::kTabCaptureDownscaleQuality, "good" },
 304   { IDS_FLAGS_TAB_CAPTURE_SCALE_QUALITY_BEST,
 305     switches::kTabCaptureDownscaleQuality, "best" },
 306 };
 307 #endif
 308
 309 #if defined(USE_AURA) || defined(OS_LINUX)
 310 const Experiment::Choice kOverlayScrollbarChoices[] = {
 311   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 312   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 313     switches::kEnableOverlayScrollbar, ""},
 314   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 315     switches::kDisableOverlayScrollbar, ""}
 316 };
 317 #endif
 318
 319 const Experiment::Choice kZeroCopyChoices[] = {
 320   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 321   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 322     switches::kEnableZeroCopy, ""},
 323   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 324     switches::kDisableZeroCopy, ""}
 325 };
 326
 327 #if defined(OS_ANDROID)
 328 const Experiment::Choice kZeroSuggestExperimentsChoices[] = {
 329   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 330   { IDS_FLAGS_ZERO_SUGGEST_MOST_VISITED,
 331     switches::kEnableZeroSuggestMostVisited, ""},
 332   { IDS_FLAGS_ZERO_SUGGEST_ETHER_SERP,
 333     switches::kEnableZeroSuggestEtherSerp, ""},
 334   { IDS_FLAGS_ZERO_SUGGEST_ETHER_NO_SERP,
 335     switches::kEnableZeroSuggestEtherNoSerp, ""},
 336   { IDS_FLAGS_ZERO_SUGGEST_PERSONALIZED,
 337     switches::kEnableZeroSuggestPersonalized, ""},
 338   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 339     switches::kDisableZeroSuggest, ""}
 340 };
 341 #endif
 342
 343 const Experiment::Choice kNumRasterThreadsChoices[] = {
 344   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 345   { IDS_FLAGS_NUM_RASTER_THREADS_ONE, switches::kNumRasterThreads, "1" },
 346   { IDS_FLAGS_NUM_RASTER_THREADS_TWO, switches::kNumRasterThreads, "2" },
 347   { IDS_FLAGS_NUM_RASTER_THREADS_THREE, switches::kNumRasterThreads, "3" },
 348   { IDS_FLAGS_NUM_RASTER_THREADS_FOUR, switches::kNumRasterThreads, "4" }
 349 };
 350
 351 const Experiment::Choice kEnableGpuRasterizationChoices[] = {
 352   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 353   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 354     switches::kEnableGpuRasterization, "" },
 355   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 356     switches::kDisableGpuRasterization, "" },
 357   { IDS_FLAGS_FORCE_GPU_RASTERIZATION,
 358     switches::kForceGpuRasterization, "" },
 359 };
 360
 361 // We're using independent flags here (as opposed to a common flag with
 362 // different values) to be able to enable/disable the entire experience
 363 // associated with this feature server-side from the FieldTrial (the complete
 364 // experience includes other flag changes as well). It is not currently possible
 365 // to do that with "flag=value" flags.
 366 const Experiment::Choice kSearchButtonInOmniboxChoices[] = {
 367   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 368   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 369     switches::kDisableSearchButtonInOmnibox, ""},
 370   { IDS_FLAGS_SEARCH_BUTTON_IN_OMNIBOX_ENABLE_FOR_STR,
 371     switches::kEnableSearchButtonInOmniboxForStr, ""},
 372   { IDS_FLAGS_SEARCH_BUTTON_IN_OMNIBOX_ENABLE_FOR_STR_OR_IIP,
 373     switches::kEnableSearchButtonInOmniboxForStrOrIip, ""},
 374   { IDS_FLAGS_SEARCH_BUTTON_IN_OMNIBOX_ENABLED,
 375     switches::kEnableSearchButtonInOmniboxAlways, ""}
 376 };
 377
 378 // See comment above for kSearchButtonInOmniboxChoices. The same reasoning
 379 // applies here.
 380 const Experiment::Choice kOriginChipChoices[] = {
 381   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 382   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED, switches::kDisableOriginChip, ""},
 383   { IDS_FLAGS_ORIGIN_CHIP_ALWAYS, switches::kEnableOriginChipAlways, ""},
 384   { IDS_FLAGS_ORIGIN_CHIP_ON_SRP, switches::kEnableOriginChipOnSrp, ""}
 385 };
 386
 387 const Experiment::Choice kTouchScrollingModeChoices[] = {
 388   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 389   { IDS_FLAGS_TOUCH_SCROLLING_MODE_TOUCHCANCEL,
 390     switches::kTouchScrollingMode,
 391     switches::kTouchScrollingModeTouchcancel },
 392   { IDS_FLAGS_TOUCH_SCROLLING_MODE_ASYNC_TOUCHMOVE,
 393     switches::kTouchScrollingMode,
 394     switches::kTouchScrollingModeAsyncTouchmove },
 395   { IDS_FLAGS_TOUCH_SCROLLING_MODE_SYNC_TOUCHMOVE,
 396     switches::kTouchScrollingMode,
 397     switches::kTouchScrollingModeSyncTouchmove },
 398 };
 399
 400 #if defined(ENABLE_APP_LIST)
 401 const Experiment::Choice kEnableSyncAppListChoices[] = {
 402   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 403   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 404     app_list::switches::kEnableSyncAppList, "" },
 405   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 406     app_list::switches::kDisableSyncAppList, "" },
 407 };
 408 #endif
 409
 410 const Experiment::Choice kExtensionContentVerificationChoices[] = {
 411   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 412   { IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_BOOTSTRAP,
 413     switches::kExtensionContentVerification,
 414     switches::kExtensionContentVerificationBootstrap },
 415   { IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_ENFORCE,
 416     switches::kExtensionContentVerification,
 417     switches::kExtensionContentVerificationEnforce },
 418   { IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_ENFORCE_STRICT,
 419     switches::kExtensionContentVerification,
 420     switches::kExtensionContentVerificationEnforceStrict },
 421 };
 422
 423 #if defined(OS_ANDROID)
 424 const Experiment::Choice kAnswersInSuggestChoices[] = {
 425   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 426   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 427     switches::kEnableAnswersInSuggest, ""},
 428   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 429     switches::kDisableAnswersInSuggest, ""}
 430 };
 431 #endif
 432
 433 // Using independent flags (instead of flag=value flags) to be able to
 434 // associate the version with a FieldTrial. FieldTrials don't currently support
 435 // flag=value flags.
 436 const Experiment::Choice kSSLInterstitialVersions[] = {
 437   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 438   { IDS_FLAGS_SSL_INTERSTITIAL_VERSION_V1,
 439     switches::kSSLInterstitialV1, "" },
 440   { IDS_FLAGS_SSL_INTERSTITIAL_VERSION_V2_GRAY,
 441     switches::kSSLInterstitialV2, "" },
 442   { IDS_FLAGS_SSL_INTERSTITIAL_VERSION_V2_COLORFUL,
 443     switches::kSSLInterstitialV2Yellow, "" },
 444   { IDS_FLAGS_SSL_INTERSTITIAL_VERSION_GUARD,
 445     switches::kSSLInterstitialV2Guard, "" },
 446   { IDS_FLAGS_SSL_INTERSTITIAL_VERSION_V1_V2,
 447     switches::kSSLInterstitialV1WithV2Text, "" },
 448 };
 449
 450 // Using independent flags (instead of flag=value flags) to be able to
 451 // associate the version with a FieldTrial. FieldTrials don't currently support
 452 // flag=value flags.
 453 const Experiment::Choice kMalwareInterstitialVersions[] = {
 454   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 455   { IDS_FLAGS_MALWARE_INTERSTITIAL_VERSION_V2,
 456     switches::kMalwareInterstitialV2, "" },
 457   { IDS_FLAGS_MALWARE_INTERSTITIAL_VERSION_V3,
 458     switches::kMalwareInterstitialV3, "" },
 459   { IDS_FLAGS_MALWARE_INTERSTITIAL_VERSION_V3_ADVICE,
 460     switches::kMalwareInterstitialV3Advice, "" },
 461   { IDS_FLAGS_MALWARE_INTERSTITIAL_VERSION_V3_SOCIAL,
 462     switches::kMalwareInterstitialV3Social, "" },
 463   { IDS_FLAGS_MALWARE_INTERSTITIAL_VERSION_V3_NOTRECOMMEND,
 464     switches::kMalwareInterstitialV3NotRecommend, "" },
 465   { IDS_FLAGS_MALWARE_INTERSTITIAL_VERSION_V3_HISTORY,
 466     switches::kMalwareInterstitialV3History, "" },
 467 };
 468
 469 #if defined(OS_CHROMEOS)
 470 const Experiment::Choice kEnableFileManagerMTPChoices[] = {
 471   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 472   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 473     chromeos::switches::kEnableFileManagerMTP, "true" },
 474   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 475     chromeos::switches::kEnableFileManagerMTP, "false" }
 476 };
 477
 478 const Experiment::Choice kEnableFileManagerNewGalleryChoices[] = {
 479   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
 480   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 481     chromeos::switches::kFileManagerEnableNewGallery, "true"},
 482   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 483     chromeos::switches::kFileManagerEnableNewGallery, "false"}
 484 };
 485 #endif
 486
 487 const Experiment::Choice kEnableSettingsWindowChoices[] = {
 488   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
 489   { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
 490     ::switches::kEnableSettingsWindow, "" },
 491   { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
 492     ::switches::kDisableSettingsWindow, "" },
 493 };
 494
 495 // RECORDING USER METRICS FOR FLAGS:
 496 // -----------------------------------------------------------------------------
 497 // The first line of the experiment is the internal name. If you'd like to
 498 // gather statistics about the usage of your flag, you should append a marker
 499 // comment to the end of the feature name, like so:
 500 //   "my-special-feature",  // FLAGS:RECORD_UMA
 501 //
 502 // After doing that, run
 503 //   tools/metrics/actions/extract_actions.py
 504 // to add the metric to actions.xml (which will enable UMA to record your
 505 // feature flag), then update the <owner>s and <description> sections. Make sure
 506 // to include the actions.xml file when you upload your code for review!
 507 //
 508 // After your feature has shipped under a flag, you can locate the metrics under
 509 // the action name AboutFlags_internal-action-name. Actions are recorded once
 510 // per startup, so you should divide this number by AboutFlags_StartupTick to
 511 // get a sense of usage. Note that this will not be the same as number of users
 512 // with a given feature enabled because users can quit and relaunch the
 513 // application multiple times over a given time interval. The dashboard also
 514 // shows you how many (metrics reporting) users have enabled the flag over the
 515 // last seven days. However, note that this is not the same as the number of
 516 // users who have the flag enabled, since enabling the flag happens once,
 517 // whereas running with the flag enabled happens until the user flips the flag
 518 // again.
 519
 520 // To add a new experiment add to the end of kExperiments. There are two
 521 // distinct types of experiments:
 522 // . SINGLE_VALUE: experiment is either on or off. Use the SINGLE_VALUE_TYPE
 523 //   macro for this type supplying the command line to the macro.
 524 // . MULTI_VALUE: a list of choices, the first of which should correspond to a
 525 //   deactivated state for this lab (i.e. no command line option).  To specify
 526 //   this type of experiment use the macro MULTI_VALUE_TYPE supplying it the
 527 //   array of choices.
 528 // See the documentation of Experiment for details on the fields.
 529 //
 530 // When adding a new choice, add it to the end of the list.
 531 const Experiment kExperiments[] = {
 532   {
 533     "ignore-gpu-blacklist",
 534     IDS_FLAGS_IGNORE_GPU_BLACKLIST_NAME,
 535     IDS_FLAGS_IGNORE_GPU_BLACKLIST_DESCRIPTION,
 536     kOsAll,
 537     SINGLE_VALUE_TYPE(switches::kIgnoreGpuBlacklist)
 538   },
 539   {
 540     "force-accelerated-composited-scrolling",
 541      IDS_FLAGS_FORCE_ACCELERATED_OVERFLOW_SCROLL_MODE_NAME,
 542      IDS_FLAGS_FORCE_ACCELERATED_OVERFLOW_SCROLL_MODE_DESCRIPTION,
 543      kOsAll,
 544      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAcceleratedOverflowScroll,
 545                                switches::kDisableAcceleratedOverflowScroll)
 546   },
 547   {
 548     "disable_layer_squashing",
 549     IDS_FLAGS_DISABLE_LAYER_SQUASHING_NAME,
 550     IDS_FLAGS_DISABLE_LAYER_SQUASHING_DESCRIPTION,
 551     kOsAll,
 552     SINGLE_VALUE_TYPE(switches::kDisableLayerSquashing)
 553   },
 554 #if defined(OS_WIN)
 555   {
 556     "disable-direct-write",
 557     IDS_FLAGS_DISABLE_DIRECT_WRITE_NAME,
 558     IDS_FLAGS_DISABLE_DIRECT_WRITE_DESCRIPTION,
 559     kOsWin,
 560     SINGLE_VALUE_TYPE(switches::kDisableDirectWrite)
 561   },
 562 #endif
 563   {
 564     "enable-experimental-canvas-features",
 565     IDS_FLAGS_ENABLE_EXPERIMENTAL_CANVAS_FEATURES_NAME,
 566     IDS_FLAGS_ENABLE_EXPERIMENTAL_CANVAS_FEATURES_DESCRIPTION,
 567     kOsAll,
 568     SINGLE_VALUE_TYPE(switches::kEnableExperimentalCanvasFeatures)
 569   },
 570   {
 571     "disable-accelerated-2d-canvas",
 572     IDS_FLAGS_DISABLE_ACCELERATED_2D_CANVAS_NAME,
 573     IDS_FLAGS_DISABLE_ACCELERATED_2D_CANVAS_DESCRIPTION,
 574     kOsAll,
 575     SINGLE_VALUE_TYPE(switches::kDisableAccelerated2dCanvas)
 576   },
 577   {
 578     "enable-display-list-2d-canvas",
 579     IDS_FLAGS_ENABLE_DISPLAY_LIST_2D_CANVAS_NAME,
 580     IDS_FLAGS_ENABLE_DISPLAY_LIST_2D_CANVAS_DESCRIPTION,
 581     kOsAll,
 582     SINGLE_VALUE_TYPE(switches::kEnableDisplayList2dCanvas)
 583   },
 584   {
 585     "composited-layer-borders",
 586     IDS_FLAGS_COMPOSITED_LAYER_BORDERS,
 587     IDS_FLAGS_COMPOSITED_LAYER_BORDERS_DESCRIPTION,
 588     kOsAll,
 589     SINGLE_VALUE_TYPE(cc::switches::kShowCompositedLayerBorders)
 590   },
 591   {
 592     "show-fps-counter",
 593     IDS_FLAGS_SHOW_FPS_COUNTER,
 594     IDS_FLAGS_SHOW_FPS_COUNTER_DESCRIPTION,
 595     kOsAll,
 596     SINGLE_VALUE_TYPE(cc::switches::kShowFPSCounter)
 597   },
 598   {
 599     "disable-webgl",
 600     IDS_FLAGS_DISABLE_WEBGL_NAME,
 601     IDS_FLAGS_DISABLE_WEBGL_DESCRIPTION,
 602     kOsAll,
 603     SINGLE_VALUE_TYPE(switches::kDisableExperimentalWebGL)
 604   },
 605   {
 606     "disable-webrtc",
 607     IDS_FLAGS_DISABLE_WEBRTC_NAME,
 608     IDS_FLAGS_DISABLE_WEBRTC_DESCRIPTION,
 609     kOsAndroid,
 610 #if defined(OS_ANDROID)
 611     SINGLE_VALUE_TYPE(switches::kDisableWebRTC)
 612 #else
 613     SINGLE_VALUE_TYPE("")
 614 #endif
 615   },
 616 #if defined(ENABLE_WEBRTC)
 617   {
 618     "disable-webrtc-hw-decoding",
 619     IDS_FLAGS_DISABLE_WEBRTC_HW_DECODING_NAME,
 620     IDS_FLAGS_DISABLE_WEBRTC_HW_DECODING_DESCRIPTION,
 621     kOsAndroid | kOsCrOS,
 622     SINGLE_VALUE_TYPE(switches::kDisableWebRtcHWDecoding)
 623   },
 624   {
 625     "disable-webrtc-hw-encoding",
 626     IDS_FLAGS_DISABLE_WEBRTC_HW_ENCODING_NAME,
 627     IDS_FLAGS_DISABLE_WEBRTC_HW_ENCODING_DESCRIPTION,
 628     kOsAndroid | kOsCrOS,
 629     SINGLE_VALUE_TYPE(switches::kDisableWebRtcHWEncoding)
 630   },
 631 #endif
 632 #if defined(OS_ANDROID)
 633   {
 634     "disable-webaudio",
 635     IDS_FLAGS_DISABLE_WEBAUDIO_NAME,
 636     IDS_FLAGS_DISABLE_WEBAUDIO_DESCRIPTION,
 637     kOsAndroid,
 638     SINGLE_VALUE_TYPE(switches::kDisableWebAudio)
 639   },
 640 #endif
 641   {
 642     "enable-compositing-for-fixed-position",
 643     IDS_FLAGS_COMPOSITING_FOR_FIXED_POSITION_NAME,
 644     IDS_FLAGS_COMPOSITING_FOR_FIXED_POSITION_DESCRIPTION,
 645     kOsAll,
 646     MULTI_VALUE_TYPE(kEnableCompositingForFixedPositionChoices)
 647   },
 648   {
 649     "enable-compositing-for-transition",
 650     IDS_FLAGS_COMPOSITING_FOR_TRANSITION_NAME,
 651     IDS_FLAGS_COMPOSITING_FOR_TRANSITION_DESCRIPTION,
 652     kOsAll,
 653     MULTI_VALUE_TYPE(kEnableCompositingForTransitionChoices)
 654   },
 655   {
 656     "enable-accelerated-fixed-root-background",
 657     IDS_FLAGS_ACCELERATED_FIXED_ROOT_BACKGROUND_NAME,
 658     IDS_FLAGS_ACCELERATED_FIXED_ROOT_BACKGROUND_DESCRIPTION,
 659     kOsAll,
 660     MULTI_VALUE_TYPE(kEnableAcceleratedFixedRootBackgroundChoices)
 661   },
 662   // Native client is compiled out when DISABLE_NACL is defined.
 663 #if !defined(DISABLE_NACL)
 664   {
 665     "enable-nacl",  // FLAGS:RECORD_UMA
 666     IDS_FLAGS_ENABLE_NACL_NAME,
 667     IDS_FLAGS_ENABLE_NACL_DESCRIPTION,
 668     kOsAll,
 669     SINGLE_VALUE_TYPE(switches::kEnableNaCl)
 670   },
 671   {
 672     "enable-nacl-debug",  // FLAGS:RECORD_UMA
 673     IDS_FLAGS_ENABLE_NACL_DEBUG_NAME,
 674     IDS_FLAGS_ENABLE_NACL_DEBUG_DESCRIPTION,
 675     kOsDesktop,
 676     SINGLE_VALUE_TYPE(switches::kEnableNaClDebug)
 677   },
 678   {
 679     "nacl-debug-mask",  // FLAGS:RECORD_UMA
 680     IDS_FLAGS_NACL_DEBUG_MASK_NAME,
 681     IDS_FLAGS_NACL_DEBUG_MASK_DESCRIPTION,
 682     kOsDesktop,
 683     MULTI_VALUE_TYPE(kNaClDebugMaskChoices)
 684   },
 685 #endif
 686   {
 687     "extension-apis",  // FLAGS:RECORD_UMA
 688     IDS_FLAGS_EXPERIMENTAL_EXTENSION_APIS_NAME,
 689     IDS_FLAGS_EXPERIMENTAL_EXTENSION_APIS_DESCRIPTION,
 690     kOsDesktop,
 691     SINGLE_VALUE_TYPE(extensions::switches::kEnableExperimentalExtensionApis)
 692   },
 693   {
 694     "extensions-on-chrome-urls",
 695     IDS_FLAGS_EXTENSIONS_ON_CHROME_URLS_NAME,
 696     IDS_FLAGS_EXTENSIONS_ON_CHROME_URLS_DESCRIPTION,
 697     kOsAll,
 698     SINGLE_VALUE_TYPE(extensions::switches::kExtensionsOnChromeURLs)
 699   },
 700   {
 701     "enable-fast-unload",
 702     IDS_FLAGS_ENABLE_FAST_UNLOAD_NAME,
 703     IDS_FLAGS_ENABLE_FAST_UNLOAD_DESCRIPTION,
 704     kOsAll,
 705     SINGLE_VALUE_TYPE(switches::kEnableFastUnload)
 706   },
 707   {
 708     "enable-app-window-controls",
 709     IDS_FLAGS_ENABLE_APP_WINDOW_CONTROLS_NAME,
 710     IDS_FLAGS_ENABLE_APP_WINDOW_CONTROLS_DESCRIPTION,
 711     kOsDesktop,
 712     SINGLE_VALUE_TYPE(switches::kEnableAppWindowControls)
 713   },
 714   {
 715     "disable-hyperlink-auditing",
 716     IDS_FLAGS_DISABLE_HYPERLINK_AUDITING_NAME,
 717     IDS_FLAGS_DISABLE_HYPERLINK_AUDITING_DESCRIPTION,
 718     kOsAll,
 719     SINGLE_VALUE_TYPE(switches::kNoPings)
 720   },
 721 #if defined(OS_ANDROID)
 722   {
 723     "enable-new-ntp",
 724     IDS_FLAGS_ENABLE_NEW_NTP,
 725     IDS_FLAGS_ENABLE_NEW_NTP_DESCRIPTION,
 726     kOsAndroid,
 727     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableNewNTP,
 728                               switches::kDisableNewNTP)
 729   },
 730   {
 731     "contextual-search",
 732     IDS_FLAGS_ENABLE_CONTEXTUAL_SEARCH,
 733     IDS_FLAGS_ENABLE_CONTEXTUAL_SEARCH_DESCRIPTION,
 734     kOsAndroid,
 735     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableContextualSearch,
 736                               switches::kDisableContextualSearch)
 737   },
 738 #endif
 739   {
 740     "show-autofill-type-predictions",
 741     IDS_FLAGS_SHOW_AUTOFILL_TYPE_PREDICTIONS_NAME,
 742     IDS_FLAGS_SHOW_AUTOFILL_TYPE_PREDICTIONS_DESCRIPTION,
 743     kOsAll,
 744     SINGLE_VALUE_TYPE(autofill::switches::kShowAutofillTypePredictions)
 745   },
 746   {
 747     "enable-smooth-scrolling",  // FLAGS:RECORD_UMA
 748     IDS_FLAGS_ENABLE_SMOOTH_SCROLLING_NAME,
 749     IDS_FLAGS_ENABLE_SMOOTH_SCROLLING_DESCRIPTION,
 750     // Can't expose the switch unless the code is compiled in.
 751     // On by default for the Mac (different implementation in WebKit).
 752     kOsLinux,
 753     SINGLE_VALUE_TYPE(switches::kEnableSmoothScrolling)
 754   },
 755 #if defined(USE_AURA) || defined(OS_LINUX)
 756   {
 757     "overlay-scrollbars",
 758     IDS_FLAGS_ENABLE_OVERLAY_SCROLLBARS_NAME,
 759     IDS_FLAGS_ENABLE_OVERLAY_SCROLLBARS_DESCRIPTION,
 760     // Uses the system preference on Mac (a different implementation).
 761     // On Android, this is always enabled.
 762     kOsLinux | kOsCrOS | kOsWin,
 763     MULTI_VALUE_TYPE(kOverlayScrollbarChoices)
 764   },
 765 #endif
 766   {
 767     "enable-panels",
 768     IDS_FLAGS_ENABLE_PANELS_NAME,
 769     IDS_FLAGS_ENABLE_PANELS_DESCRIPTION,
 770     kOsDesktop,
 771     SINGLE_VALUE_TYPE(switches::kEnablePanels)
 772   },
 773   {
 774     // See http://crbug.com/120416 for how to remove this flag.
 775     "save-page-as-mhtml",  // FLAGS:RECORD_UMA
 776     IDS_FLAGS_SAVE_PAGE_AS_MHTML_NAME,
 777     IDS_FLAGS_SAVE_PAGE_AS_MHTML_DESCRIPTION,
 778     kOsMac | kOsWin | kOsLinux,
 779     SINGLE_VALUE_TYPE(switches::kSavePageAsMHTML)
 780   },
 781   {
 782     "enable-quic",
 783     IDS_FLAGS_ENABLE_QUIC_NAME,
 784     IDS_FLAGS_ENABLE_QUIC_DESCRIPTION,
 785     kOsAll,
 786     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableQuic,
 787                               switches::kDisableQuic)
 788   },
 789   {
 790     "enable-spdy4",
 791     IDS_FLAGS_ENABLE_SPDY4_NAME,
 792     IDS_FLAGS_ENABLE_SPDY4_DESCRIPTION,
 793     kOsAll,
 794     SINGLE_VALUE_TYPE(switches::kEnableSpdy4)
 795   },
 796   {
 797     "enable-async-dns",
 798     IDS_FLAGS_ENABLE_ASYNC_DNS_NAME,
 799     IDS_FLAGS_ENABLE_ASYNC_DNS_DESCRIPTION,
 800     kOsWin | kOsMac | kOsLinux | kOsCrOS,
 801     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAsyncDns,
 802                               switches::kDisableAsyncDns)
 803   },
 804   {
 805     "disable-media-source",
 806     IDS_FLAGS_DISABLE_MEDIA_SOURCE_NAME,
 807     IDS_FLAGS_DISABLE_MEDIA_SOURCE_DESCRIPTION,
 808     kOsAll,
 809     SINGLE_VALUE_TYPE(switches::kDisableMediaSource)
 810   },
 811   {
 812     "enable-encrypted-media",
 813     IDS_FLAGS_ENABLE_ENCRYPTED_MEDIA_NAME,
 814     IDS_FLAGS_ENABLE_ENCRYPTED_MEDIA_DESCRIPTION,
 815     kOsAll,
 816     SINGLE_VALUE_TYPE(switches::kEnableEncryptedMedia)
 817   },
 818   {
 819     "disable-prefixed-encrypted-media",
 820     IDS_FLAGS_DISABLE_PREFIXED_ENCRYPTED_MEDIA_NAME,
 821     IDS_FLAGS_DISABLE_PREFIXED_ENCRYPTED_MEDIA_DESCRIPTION,
 822     kOsAll,
 823     SINGLE_VALUE_TYPE(switches::kDisablePrefixedEncryptedMedia)
 824   },
 825 #if defined(OS_ANDROID)
 826   {
 827     "disable-infobar-for-protected-media-identifier",
 828     IDS_FLAGS_DISABLE_INFOBAR_FOR_PROTECTED_MEDIA_IDENTIFIER_NAME,
 829     IDS_FLAGS_DISABLE_INFOBAR_FOR_PROTECTED_MEDIA_IDENTIFIER_DESCRIPTION,
 830     kOsAndroid,
 831     SINGLE_VALUE_TYPE(switches::kDisableInfobarForProtectedMediaIdentifier)
 832   },
 833   {
 834     "mediadrm-enable-non-compositing",
 835     IDS_FLAGS_MEDIADRM_ENABLE_NON_COMPOSITING_NAME,
 836     IDS_FLAGS_MEDIADRM_ENABLE_NON_COMPOSITING_DESCRIPTION,
 837     kOsAndroid,
 838     SINGLE_VALUE_TYPE(switches::kMediaDrmEnableNonCompositing)
 839   },
 840 #endif  // defined(OS_ANDROID)
 841   {
 842     "enable-javascript-harmony",
 843     IDS_FLAGS_ENABLE_JAVASCRIPT_HARMONY_NAME,
 844     IDS_FLAGS_ENABLE_JAVASCRIPT_HARMONY_DESCRIPTION,
 845     kOsAll,
 846     SINGLE_VALUE_TYPE_AND_VALUE(switches::kJavaScriptFlags, "--harmony")
 847   },
 848   {
 849     "disable-software-rasterizer",
 850     IDS_FLAGS_DISABLE_SOFTWARE_RASTERIZER_NAME,
 851     IDS_FLAGS_DISABLE_SOFTWARE_RASTERIZER_DESCRIPTION,
 852 #if defined(ENABLE_SWIFTSHADER)
 853     kOsAll,
 854 #else
 855     0,
 856 #endif
 857     SINGLE_VALUE_TYPE(switches::kDisableSoftwareRasterizer)
 858   },
 859   {
 860     "enable-gpu-rasterization",
 861     IDS_FLAGS_ENABLE_GPU_RASTERIZATION_NAME,
 862     IDS_FLAGS_ENABLE_GPU_RASTERIZATION_DESCRIPTION,
 863     kOsAndroid,
 864     MULTI_VALUE_TYPE(kEnableGpuRasterizationChoices)
 865   },
 866   {
 867     "enable-experimental-web-platform-features",
 868     IDS_FLAGS_EXPERIMENTAL_WEB_PLATFORM_FEATURES_NAME,
 869     IDS_FLAGS_EXPERIMENTAL_WEB_PLATFORM_FEATURES_DESCRIPTION,
 870     kOsAll,
 871     SINGLE_VALUE_TYPE(switches::kEnableExperimentalWebPlatformFeatures)
 872   },
 873   {
 874     "disable-ntp-other-sessions-menu",
 875     IDS_FLAGS_NTP_OTHER_SESSIONS_MENU_NAME,
 876     IDS_FLAGS_NTP_OTHER_SESSIONS_MENU_DESCRIPTION,
 877     kOsDesktop,
 878     SINGLE_VALUE_TYPE(switches::kDisableNTPOtherSessionsMenu)
 879   },
 880   {
 881     "enable-devtools-experiments",
 882     IDS_FLAGS_ENABLE_DEVTOOLS_EXPERIMENTS_NAME,
 883     IDS_FLAGS_ENABLE_DEVTOOLS_EXPERIMENTS_DESCRIPTION,
 884     kOsDesktop,
 885     SINGLE_VALUE_TYPE(switches::kEnableDevToolsExperiments)
 886   },
 887   {
 888     "silent-debugger-extension-api",
 889     IDS_FLAGS_SILENT_DEBUGGER_EXTENSION_API_NAME,
 890     IDS_FLAGS_SILENT_DEBUGGER_EXTENSION_API_DESCRIPTION,
 891     kOsDesktop,
 892     SINGLE_VALUE_TYPE(switches::kSilentDebuggerExtensionAPI)
 893   },
 894   {
 895     "spellcheck-autocorrect",
 896     IDS_FLAGS_SPELLCHECK_AUTOCORRECT,
 897     IDS_FLAGS_SPELLCHECK_AUTOCORRECT_DESCRIPTION,
 898     kOsWin | kOsLinux | kOsCrOS,
 899     SINGLE_VALUE_TYPE(switches::kEnableSpellingAutoCorrect)
 900   },
 901   {
 902     "enable-scroll-prediction",
 903     IDS_FLAGS_ENABLE_SCROLL_PREDICTION_NAME,
 904     IDS_FLAGS_ENABLE_SCROLL_PREDICTION_DESCRIPTION,
 905     kOsDesktop,
 906     SINGLE_VALUE_TYPE(switches::kEnableScrollPrediction)
 907   },
 908   {
 909     "touch-events",
 910     IDS_TOUCH_EVENTS_NAME,
 911     IDS_TOUCH_EVENTS_DESCRIPTION,
 912     kOsDesktop,
 913     MULTI_VALUE_TYPE(kTouchEventsChoices)
 914   },
 915   {
 916     "disable-touch-adjustment",
 917     IDS_DISABLE_TOUCH_ADJUSTMENT_NAME,
 918     IDS_DISABLE_TOUCH_ADJUSTMENT_DESCRIPTION,
 919     kOsWin | kOsLinux | kOsCrOS,
 920     SINGLE_VALUE_TYPE(switches::kDisableTouchAdjustment)
 921   },
 922 #if defined(OS_CHROMEOS)
 923   {
 924     "network-portal-notification",
 925     IDS_FLAGS_NETWORK_PORTAL_NOTIFICATION_NAME,
 926     IDS_FLAGS_NETWORK_PORTAL_NOTIFICATION_DESCRIPTION,
 927     kOsCrOS,
 928     ENABLE_DISABLE_VALUE_TYPE(
 929         chromeos::switches::kEnableNetworkPortalNotification,
 930         chromeos::switches::kDisableNetworkPortalNotification)
 931   },
 932 #endif
 933   {
 934     "enable-download-resumption",
 935     IDS_FLAGS_ENABLE_DOWNLOAD_RESUMPTION_NAME,
 936     IDS_FLAGS_ENABLE_DOWNLOAD_RESUMPTION_DESCRIPTION,
 937     kOsDesktop,
 938     SINGLE_VALUE_TYPE(switches::kEnableDownloadResumption)
 939   },
 940   // Native client is compiled out when DISABLE_NACL is defined.
 941 #if !defined(DISABLE_NACL)
 942   {
 943     "allow-nacl-socket-api",
 944     IDS_FLAGS_ALLOW_NACL_SOCKET_API_NAME,
 945     IDS_FLAGS_ALLOW_NACL_SOCKET_API_DESCRIPTION,
 946     kOsDesktop,
 947     SINGLE_VALUE_TYPE_AND_VALUE(switches::kAllowNaClSocketAPI, "*")
 948   },
 949 #endif
 950 #if defined(OS_CHROMEOS) || defined(OS_WIN) || defined(OS_LINUX)
 951   {
 952     "force-device-scale-factor",
 953     IDS_FLAGS_FORCE_DEVICE_SCALE_FACTOR_NAME,
 954     IDS_FLAGS_FORCE_DEVICE_SCALE_FACTOR_DESCRIPTION,
 955     kOsLinux | kOsWin | kOsCrOS,
 956     MULTI_VALUE_TYPE(kDeviceScaleFactorChoices)
 957   },
 958 #endif
 959 #if defined(OS_CHROMEOS)
 960   {
 961     "allow-touchpad-three-finger-click",
 962     IDS_FLAGS_ALLOW_TOUCHPAD_THREE_FINGER_CLICK_NAME,
 963     IDS_FLAGS_ALLOW_TOUCHPAD_THREE_FINGER_CLICK_DESCRIPTION,
 964     kOsCrOS,
 965     SINGLE_VALUE_TYPE(chromeos::switches::kEnableTouchpadThreeFingerClick)
 966   },
 967 #endif
 968 #if defined(USE_ASH)
 969   {
 970     "disable-minimize-on-second-launcher-item-click",
 971     IDS_FLAGS_DISABLE_MINIMIZE_ON_SECOND_LAUNCHER_ITEM_CLICK_NAME,
 972     IDS_FLAGS_DISABLE_MINIMIZE_ON_SECOND_LAUNCHER_ITEM_CLICK_DESCRIPTION,
 973     kOsAll,
 974     SINGLE_VALUE_TYPE(switches::kDisableMinimizeOnSecondLauncherItemClick)
 975   },
 976   {
 977     "show-touch-hud",
 978     IDS_FLAGS_SHOW_TOUCH_HUD_NAME,
 979     IDS_FLAGS_SHOW_TOUCH_HUD_DESCRIPTION,
 980     kOsAll,
 981     SINGLE_VALUE_TYPE(ash::switches::kAshTouchHud)
 982   },
 983   {
 984     "enable-pinch",
 985     IDS_FLAGS_ENABLE_PINCH_SCALE_NAME,
 986     IDS_FLAGS_ENABLE_PINCH_SCALE_DESCRIPTION,
 987     kOsLinux | kOsWin | kOsCrOS,
 988     ENABLE_DISABLE_VALUE_TYPE(switches::kEnablePinch, switches::kDisablePinch),
 989   },
 990 #endif  // defined(USE_ASH)
 991   {
 992     "enable-pinch-virtual-viewport",
 993     IDS_FLAGS_ENABLE_PINCH_VIRTUAL_VIEWPORT_NAME,
 994     IDS_FLAGS_ENABLE_PINCH_VIRTUAL_VIEWPORT_DESCRIPTION,
 995     kOsLinux | kOsWin | kOsCrOS | kOsAndroid,
 996     ENABLE_DISABLE_VALUE_TYPE(
 997         cc::switches::kEnablePinchVirtualViewport,
 998         cc::switches::kDisablePinchVirtualViewport),
 999   },
1000   {
1001     "enable-viewport-meta",
1002     IDS_FLAGS_ENABLE_VIEWPORT_META_NAME,
1003     IDS_FLAGS_ENABLE_VIEWPORT_META_DESCRIPTION,
1004     kOsLinux | kOsWin | kOsCrOS | kOsMac,
1005     SINGLE_VALUE_TYPE(switches::kEnableViewportMeta),
1006   },
1007 #if defined(OS_CHROMEOS)
1008   {
1009     "disable-boot-animation",
1010     IDS_FLAGS_DISABLE_BOOT_ANIMATION,
1011     IDS_FLAGS_DISABLE_BOOT_ANIMATION_DESCRIPTION,
1012     kOsCrOSOwnerOnly,
1013     SINGLE_VALUE_TYPE(chromeos::switches::kDisableBootAnimation),
1014   },
1015   {
1016     "enable-new-gallery",
1017     IDS_FLAGS_FILE_MANAGER_ENABLE_NEW_GALLERY_NAME,
1018     IDS_FLAGS_FILE_MANAGER_ENABLE_NEW_GALLERY_DESCRIPTION,
1019     kOsCrOS,
1020     MULTI_VALUE_TYPE(kEnableFileManagerNewGalleryChoices)
1021   },
1022   {
1023     "enable-video-player-chromecast-support",
1024     IDS_FLAGS_ENABLE_VIDEO_PLAYER_CHROMECAST_SUPPORT_NAME,
1025     IDS_FLAGS_ENABLE_VIDEO_PLAYER_CHROMECAST_SUPPORT_DESCRIPTION,
1026     kOsCrOS,
1027     SINGLE_VALUE_TYPE(chromeos::switches::kEnableVideoPlayerChromecastSupport)
1028   },
1029   {
1030     "disable-office-editing-component-app",
1031     IDS_FLAGS_DISABLE_OFFICE_EDITING_COMPONENT_APP_NAME,
1032     IDS_FLAGS_DISABLE_OFFICE_EDITING_COMPONENT_APP_DESCRIPTION,
1033     kOsCrOS,
1034     SINGLE_VALUE_TYPE(chromeos::switches::kDisableOfficeEditingComponentApp),
1035   },
1036   {
1037     "disable-display-color-calibration",
1038     IDS_FLAGS_DISABLE_DISPLAY_COLOR_CALIBRATION_NAME,
1039     IDS_FLAGS_DISABLE_DISPLAY_COLOR_CALIBRATION_DESCRIPTION,
1040     kOsCrOS,
1041     SINGLE_VALUE_TYPE(ui::switches::kDisableDisplayColorCalibration),
1042   },
1043 #endif  // defined(OS_CHROMEOS)
1044   { "disable-accelerated-video-decode",
1045     IDS_FLAGS_DISABLE_ACCELERATED_VIDEO_DECODE_NAME,
1046     IDS_FLAGS_DISABLE_ACCELERATED_VIDEO_DECODE_DESCRIPTION,
1047     kOsWin | kOsCrOS,
1048     SINGLE_VALUE_TYPE(switches::kDisableAcceleratedVideoDecode),
1049   },
1050 #if defined(USE_ASH)
1051   {
1052     "ash-debug-shortcuts",
1053     IDS_FLAGS_DEBUG_SHORTCUTS_NAME,
1054     IDS_FLAGS_DEBUG_SHORTCUTS_DESCRIPTION,
1055     kOsAll,
1056     SINGLE_VALUE_TYPE(ash::switches::kAshDebugShortcuts),
1057   },
1058   { "ash-enable-touch-view-testing",
1059     IDS_FLAGS_ASH_ENABLE_TOUCH_VIEW_TESTING_NAME,
1060     IDS_FLAGS_ASH_ENABLE_TOUCH_VIEW_TESTING_DESCRIPTION,
1061     kOsCrOS,
1062     SINGLE_VALUE_TYPE(ash::switches::kAshEnableTouchViewTesting),
1063   },
1064   { "ash-disable-text-filtering-in-overview-mode",
1065     IDS_FLAGS_ASH_DISABLE_TEXT_FILTERING_IN_OVERVIEW_MODE_NAME,
1066     IDS_FLAGS_ASH_DISABLE_TEXT_FILTERING_IN_OVERVIEW_MODE_DESCRIPTION,
1067     kOsCrOS,
1068     SINGLE_VALUE_TYPE(ash::switches::kAshDisableTextFilteringInOverviewMode),
1069   },
1070 #endif
1071 #if defined(OS_CHROMEOS)
1072   {
1073     "enable-carrier-switching",
1074     IDS_FLAGS_ENABLE_CARRIER_SWITCHING,
1075     IDS_FLAGS_ENABLE_CARRIER_SWITCHING_DESCRIPTION,
1076     kOsCrOS,
1077     SINGLE_VALUE_TYPE(chromeos::switches::kEnableCarrierSwitching)
1078   },
1079   {
1080     "enable-request-tablet-site",
1081     IDS_FLAGS_ENABLE_REQUEST_TABLET_SITE_NAME,
1082     IDS_FLAGS_ENABLE_REQUEST_TABLET_SITE_DESCRIPTION,
1083     kOsCrOS,
1084     SINGLE_VALUE_TYPE(chromeos::switches::kEnableRequestTabletSite)
1085   },
1086 #endif
1087   {
1088     "debug-packed-apps",
1089     IDS_FLAGS_DEBUG_PACKED_APP_NAME,
1090     IDS_FLAGS_DEBUG_PACKED_APP_DESCRIPTION,
1091     kOsDesktop,
1092     SINGLE_VALUE_TYPE(switches::kDebugPackedApps)
1093   },
1094   {
1095     "enable-password-generation",
1096     IDS_FLAGS_ENABLE_PASSWORD_GENERATION_NAME,
1097     IDS_FLAGS_ENABLE_PASSWORD_GENERATION_DESCRIPTION,
1098     kOsWin | kOsLinux | kOsCrOS,
1099     ENABLE_DISABLE_VALUE_TYPE(autofill::switches::kEnablePasswordGeneration,
1100                               autofill::switches::kDisablePasswordGeneration)
1101   },
1102   {
1103     "enable-automatic-password-saving",
1104     IDS_FLAGS_ENABLE_AUTOMATIC_PASSWORD_SAVING_NAME,
1105     IDS_FLAGS_ENABLE_AUTOMATIC_PASSWORD_SAVING_DESCRIPTION,
1106     kOsDesktop,
1107     SINGLE_VALUE_TYPE(
1108         password_manager::switches::kEnableAutomaticPasswordSaving)
1109   },
1110   {
1111     "password-manager-reauthentication",
1112     IDS_FLAGS_PASSWORD_MANAGER_REAUTHENTICATION_NAME,
1113     IDS_FLAGS_PASSWORD_MANAGER_REAUTHENTICATION_DESCRIPTION,
1114     kOsMac | kOsWin,
1115     SINGLE_VALUE_TYPE(switches::kDisablePasswordManagerReauthentication)
1116   },
1117   {
1118     "enable-deferred-image-decoding",
1119     IDS_FLAGS_ENABLE_DEFERRED_IMAGE_DECODING_NAME,
1120     IDS_FLAGS_ENABLE_DEFERRED_IMAGE_DECODING_DESCRIPTION,
1121     kOsMac | kOsLinux | kOsCrOS,
1122     SINGLE_VALUE_TYPE(switches::kEnableDeferredImageDecoding)
1123   },
1124   {
1125     "performance-monitor-gathering",
1126     IDS_FLAGS_PERFORMANCE_MONITOR_GATHERING_NAME,
1127     IDS_FLAGS_PERFORMANCE_MONITOR_GATHERING_DESCRIPTION,
1128     kOsAll,
1129     SINGLE_VALUE_TYPE(switches::kPerformanceMonitorGathering)
1130   },
1131   {
1132     "wallet-service-use-sandbox",
1133     IDS_FLAGS_WALLET_SERVICE_USE_SANDBOX_NAME,
1134     IDS_FLAGS_WALLET_SERVICE_USE_SANDBOX_DESCRIPTION,
1135     kOsAndroid | kOsDesktop,
1136     ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(
1137         autofill::switches::kWalletServiceUseSandbox, "1",
1138         autofill::switches::kWalletServiceUseSandbox, "0")
1139   },
1140 #if defined(USE_AURA)
1141   {
1142     "overscroll-history-navigation",
1143     IDS_FLAGS_OVERSCROLL_HISTORY_NAVIGATION_NAME,
1144     IDS_FLAGS_OVERSCROLL_HISTORY_NAVIGATION_DESCRIPTION,
1145     kOsAll,
1146     MULTI_VALUE_TYPE(kOverscrollHistoryNavigationChoices)
1147   },
1148 #endif
1149   {
1150     "scroll-end-effect",
1151     IDS_FLAGS_SCROLL_END_EFFECT_NAME,
1152     IDS_FLAGS_SCROLL_END_EFFECT_DESCRIPTION,
1153     kOsCrOS,
1154     ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(
1155         switches::kScrollEndEffect, "1",
1156         switches::kScrollEndEffect, "0")
1157   },
1158   {
1159     "enable-touch-drag-drop",
1160     IDS_FLAGS_ENABLE_TOUCH_DRAG_DROP_NAME,
1161     IDS_FLAGS_ENABLE_TOUCH_DRAG_DROP_DESCRIPTION,
1162     kOsWin | kOsCrOS,
1163     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableTouchDragDrop,
1164                               switches::kDisableTouchDragDrop)
1165   },
1166   {
1167     "enable-touch-editing",
1168     IDS_FLAGS_ENABLE_TOUCH_EDITING_NAME,
1169     IDS_FLAGS_ENABLE_TOUCH_EDITING_DESCRIPTION,
1170     kOsCrOS | kOsWin | kOsLinux,
1171     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableTouchEditing,
1172                               switches::kDisableTouchEditing)
1173   },
1174   {
1175     "enable-suggestions-service",
1176     IDS_FLAGS_ENABLE_SUGGESTIONS_SERVICE_NAME,
1177     IDS_FLAGS_ENABLE_SUGGESTIONS_SERVICE_DESCRIPTION,
1178     kOsAndroid | kOsCrOS,
1179     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSuggestionsService,
1180                               switches::kDisableSuggestionsService)
1181   },
1182   {
1183     "enable-sync-synced-notifications",
1184     IDS_FLAGS_ENABLE_SYNCED_NOTIFICATIONS_NAME,
1185     IDS_FLAGS_ENABLE_SYNCED_NOTIFICATIONS_DESCRIPTION,
1186     kOsDesktop,
1187     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSyncSyncedNotifications,
1188                               switches::kDisableSyncSyncedNotifications)
1189   },
1190 #if defined(ENABLE_APP_LIST)
1191   {
1192     "enable-sync-app-list",
1193     IDS_FLAGS_ENABLE_SYNC_APP_LIST_NAME,
1194     IDS_FLAGS_ENABLE_SYNC_APP_LIST_DESCRIPTION,
1195     kOsDesktop,
1196     MULTI_VALUE_TYPE(kEnableSyncAppListChoices)
1197   },
1198 #endif
1199 #if defined(OS_MACOSX)
1200   {
1201     "enable-avfoundation",
1202     IDS_FLAGS_ENABLE_AVFOUNDATION_NAME,
1203     IDS_FLAGS_ENABLE_AVFOUNDATION_DESCRIPTION,
1204     kOsMac,
1205     SINGLE_VALUE_TYPE(switches::kEnableAVFoundation)
1206   },
1207 #endif
1208   {
1209     "impl-side-painting",
1210     IDS_FLAGS_IMPL_SIDE_PAINTING_NAME,
1211     IDS_FLAGS_IMPL_SIDE_PAINTING_DESCRIPTION,
1212     kOsAll,
1213     MULTI_VALUE_TYPE(kImplSidePaintingChoices)
1214   },
1215   {
1216     "lcd-text-aa",
1217     IDS_FLAGS_LCD_TEXT_NAME,
1218     IDS_FLAGS_LCD_TEXT_DESCRIPTION,
1219     kOsDesktop,
1220     MULTI_VALUE_TYPE(kLCDTextChoices)
1221   },
1222 #if defined(OS_ANDROID) || defined(OS_MACOSX)
1223   {
1224     "delegated-renderer",
1225     IDS_FLAGS_DELEGATED_RENDERER_NAME,
1226     IDS_FLAGS_DELEGATED_RENDERER_DESCRIPTION,
1227     kOsAndroid,  // TODO(ccameron) Add mac support soon.
1228     MULTI_VALUE_TYPE(kDelegatedRendererChoices)
1229   },
1230 #endif
1231   {
1232     "max-tiles-for-interest-area",
1233     IDS_FLAGS_MAX_TILES_FOR_INTEREST_AREA_NAME,
1234     IDS_FLAGS_MAX_TILES_FOR_INTEREST_AREA_DESCRIPTION,
1235     kOsAll,
1236     MULTI_VALUE_TYPE(kMaxTilesForInterestAreaChoices)
1237   },
1238   {
1239     "enable-offline-auto-reload",
1240     IDS_FLAGS_ENABLE_OFFLINE_AUTO_RELOAD_NAME,
1241     IDS_FLAGS_ENABLE_OFFLINE_AUTO_RELOAD_DESCRIPTION,
1242     kOsAll,
1243     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableOfflineAutoReload,
1244                               switches::kDisableOfflineAutoReload)
1245   },
1246   {
1247     "enable-offline-auto-reload-visible-only",
1248     IDS_FLAGS_ENABLE_OFFLINE_AUTO_RELOAD_VISIBLE_ONLY_NAME,
1249     IDS_FLAGS_ENABLE_OFFLINE_AUTO_RELOAD_VISIBLE_ONLY_DESCRIPTION,
1250     kOsAll,
1251     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableOfflineAutoReloadVisibleOnly,
1252                               switches::kDisableOfflineAutoReloadVisibleOnly)
1253   },
1254   {
1255     "enable-offline-load-stale-cache",
1256     IDS_FLAGS_ENABLE_OFFLINE_LOAD_STALE_NAME,
1257     IDS_FLAGS_ENABLE_OFFLINE_LOAD_STALE_DESCRIPTION,
1258     kOsLinux | kOsMac | kOsWin | kOsAndroid,
1259     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableOfflineLoadStaleCache,
1260                               switches::kDisableOfflineLoadStaleCache)
1261   },
1262   {
1263     "default-tile-width",
1264     IDS_FLAGS_DEFAULT_TILE_WIDTH_NAME,
1265     IDS_FLAGS_DEFAULT_TILE_WIDTH_DESCRIPTION,
1266     kOsAll,
1267     MULTI_VALUE_TYPE(kDefaultTileWidthChoices)
1268   },
1269   {
1270     "default-tile-height",
1271     IDS_FLAGS_DEFAULT_TILE_HEIGHT_NAME,
1272     IDS_FLAGS_DEFAULT_TILE_HEIGHT_DESCRIPTION,
1273     kOsAll,
1274     MULTI_VALUE_TYPE(kDefaultTileHeightChoices)
1275   },
1276 #if defined(OS_ANDROID)
1277   {
1278     "disable-gesture-requirement-for-media-playback",
1279     IDS_FLAGS_DISABLE_GESTURE_REQUIREMENT_FOR_MEDIA_PLAYBACK_NAME,
1280     IDS_FLAGS_DISABLE_GESTURE_REQUIREMENT_FOR_MEDIA_PLAYBACK_DESCRIPTION,
1281     kOsAndroid,
1282     SINGLE_VALUE_TYPE(switches::kDisableGestureRequirementForMediaPlayback)
1283   },
1284 #endif
1285 #if defined(OS_CHROMEOS)
1286   {
1287     "enable-virtual-keyboard",
1288     IDS_FLAGS_ENABLE_VIRTUAL_KEYBOARD_NAME,
1289     IDS_FLAGS_ENABLE_VIRTUAL_KEYBOARD_DESCRIPTION,
1290     kOsCrOS,
1291     SINGLE_VALUE_TYPE(keyboard::switches::kEnableVirtualKeyboard)
1292   },
1293   {
1294     "enable-virtual-keyboard-overscroll",
1295     IDS_FLAGS_ENABLE_VIRTUAL_KEYBOARD_OVERSCROLL_NAME,
1296     IDS_FLAGS_ENABLE_VIRTUAL_KEYBOARD_OVERSCROLL_DESCRIPTION,
1297     kOsCrOS,
1298     ENABLE_DISABLE_VALUE_TYPE(
1299         keyboard::switches::kEnableVirtualKeyboardOverscroll,
1300         keyboard::switches::kDisableVirtualKeyboardOverscroll)
1301   },
1302   {
1303     "enable-swipe-selection",
1304     IDS_FLAGS_ENABLE_SWIPE_SELECTION_NAME,
1305     IDS_FLAGS_ENABLE_SWIPE_SELECTION_DESCRIPTION,
1306     kOsCrOS,
1307     SINGLE_VALUE_TYPE(keyboard::switches::kEnableSwipeSelection)
1308   },
1309   {
1310     "enable-input-view",
1311     IDS_FLAGS_ENABLE_INPUT_VIEW_NAME,
1312     IDS_FLAGS_ENABLE_INPUT_VIEW_DESCRIPTION,
1313     kOsCrOS,
1314     ENABLE_DISABLE_VALUE_TYPE(keyboard::switches::kEnableInputView,
1315                               keyboard::switches::kDisableInputView)
1316   },
1317   {
1318     "enable-experimental-input-view-features",
1319     IDS_FLAGS_ENABLE_EXPERIMENTAL_INPUT_VIEW_FEATURES_NAME,
1320     IDS_FLAGS_ENABLE_EXPERIMENTAL_INPUT_VIEW_FEATURES_DESCRIPTION,
1321     kOsCrOS,
1322     SINGLE_VALUE_TYPE(keyboard::switches::kEnableExperimentalInputViewFeatures)
1323   },
1324 #endif
1325   {
1326     "enable-simple-cache-backend",
1327     IDS_FLAGS_ENABLE_SIMPLE_CACHE_BACKEND_NAME,
1328     IDS_FLAGS_ENABLE_SIMPLE_CACHE_BACKEND_DESCRIPTION,
1329     kOsWin | kOsMac | kOsLinux | kOsCrOS,
1330     MULTI_VALUE_TYPE(kSimpleCacheBackendChoices)
1331   },
1332   {
1333     "enable-tcp-fast-open",
1334     IDS_FLAGS_ENABLE_TCP_FAST_OPEN_NAME,
1335     IDS_FLAGS_ENABLE_TCP_FAST_OPEN_DESCRIPTION,
1336     kOsLinux | kOsCrOS | kOsAndroid,
1337     SINGLE_VALUE_TYPE(switches::kEnableTcpFastOpen)
1338   },
1339 #if defined(ENABLE_SERVICE_DISCOVERY)
1340   {
1341     "disable-device-discovery",
1342     IDS_FLAGS_DISABLE_DEVICE_DISCOVERY_NAME,
1343     IDS_FLAGS_DISABLE_DEVICE_DISCOVERY_DESCRIPTION,
1344     kOsDesktop,
1345     SINGLE_VALUE_TYPE(switches::kDisableDeviceDiscovery)
1346   },
1347   {
1348     "device-discovery-notifications",
1349     IDS_FLAGS_DEVICE_DISCOVERY_NOTIFICATIONS_NAME,
1350     IDS_FLAGS_DEVICE_DISCOVERY_NOTIFICATIONS_DESCRIPTION,
1351     kOsDesktop,
1352     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableDeviceDiscoveryNotifications,
1353                               switches::kDisableDeviceDiscoveryNotifications)
1354   },
1355   {
1356     "enable-cloud-devices",
1357     IDS_FLAGS_ENABLE_CLOUD_DEVICES_NAME,
1358     IDS_FLAGS_ENABLE_CLOUD_DEVICES_DESCRIPTION,
1359     kOsDesktop,
1360     SINGLE_VALUE_TYPE(switches::kEnableCloudDevices)
1361   },
1362   {
1363     "enable-print-preview-register-promos",
1364     IDS_FLAGS_ENABLE_PRINT_PREVIEW_REGISTER_PROMOS_NAME,
1365     IDS_FLAGS_ENABLE_PRINT_PREVIEW_REGISTER_PROMOS_DESCRIPTION,
1366     kOsDesktop,
1367     SINGLE_VALUE_TYPE(switches::kEnablePrintPreviewRegisterPromos)
1368   },
1369 #endif  // ENABLE_SERVICE_DISCOVERY
1370 #if defined(OS_WIN)
1371   {
1372     "enable-cloud-print-xps",
1373     IDS_FLAGS_ENABLE_CLOUD_PRINT_XPS_NAME,
1374     IDS_FLAGS_ENABLE_CLOUD_PRINT_XPS_DESCRIPTION,
1375     kOsWin,
1376     SINGLE_VALUE_TYPE(switches::kEnableCloudPrintXps)
1377   },
1378 #endif
1379 #if defined(OS_MACOSX)
1380   {
1381     "enable-simplified-fullscreen",
1382     IDS_FLAGS_ENABLE_SIMPLIFIED_FULLSCREEN_NAME,
1383     IDS_FLAGS_ENABLE_SIMPLIFIED_FULLSCREEN_DESCRIPTION,
1384     kOsMac,
1385     SINGLE_VALUE_TYPE(switches::kEnableSimplifiedFullscreen)
1386   },
1387 #endif
1388 #if defined(USE_AURA)
1389   {
1390     "tab-capture-upscale-quality",
1391     IDS_FLAGS_TAB_CAPTURE_UPSCALE_QUALITY_NAME,
1392     IDS_FLAGS_TAB_CAPTURE_UPSCALE_QUALITY_DESCRIPTION,
1393     kOsAll,
1394     MULTI_VALUE_TYPE(kTabCaptureUpscaleQualityChoices)
1395   },
1396   {
1397     "tab-capture-downscale-quality",
1398     IDS_FLAGS_TAB_CAPTURE_DOWNSCALE_QUALITY_NAME,
1399     IDS_FLAGS_TAB_CAPTURE_DOWNSCALE_QUALITY_DESCRIPTION,
1400     kOsAll,
1401     MULTI_VALUE_TYPE(kTabCaptureDownscaleQualityChoices)
1402   },
1403 #endif
1404   {
1405     "enable-spelling-feedback-field-trial",
1406     IDS_FLAGS_ENABLE_SPELLING_FEEDBACK_FIELD_TRIAL_NAME,
1407     IDS_FLAGS_ENABLE_SPELLING_FEEDBACK_FIELD_TRIAL_DESCRIPTION,
1408     kOsAll,
1409     SINGLE_VALUE_TYPE(switches::kEnableSpellingFeedbackFieldTrial)
1410   },
1411   {
1412     "enable-webgl-draft-extensions",
1413     IDS_FLAGS_ENABLE_WEBGL_DRAFT_EXTENSIONS_NAME,
1414     IDS_FLAGS_ENABLE_WEBGL_DRAFT_EXTENSIONS_DESCRIPTION,
1415     kOsAll,
1416     SINGLE_VALUE_TYPE(switches::kEnableWebGLDraftExtensions)
1417   },
1418   {
1419     "enable-web-midi",
1420     IDS_FLAGS_ENABLE_WEB_MIDI_NAME,
1421     IDS_FLAGS_ENABLE_WEB_MIDI_DESCRIPTION,
1422     kOsMac | kOsWin | kOsLinux | kOsCrOS | kOsAndroid,
1423     SINGLE_VALUE_TYPE(switches::kEnableWebMIDI)
1424   },
1425   {
1426     "enable-new-profile-management",
1427     IDS_FLAGS_ENABLE_NEW_PROFILE_MANAGEMENT_NAME,
1428     IDS_FLAGS_ENABLE_NEW_PROFILE_MANAGEMENT_DESCRIPTION,
1429     kOsAndroid | kOsMac | kOsWin | kOsLinux | kOsCrOS,
1430     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableNewProfileManagement,
1431                               switches::kDisableNewProfileManagement)
1432   },
1433   {
1434     "enable-account-consistency",
1435     IDS_FLAGS_ENABLE_ACCOUNT_CONSISTENCY_NAME,
1436     IDS_FLAGS_ENABLE_ACCOUNT_CONSISTENCY_DESCRIPTION,
1437     kOsAndroid | kOsMac | kOsWin | kOsLinux | kOsCrOS,
1438     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableAccountConsistency,
1439                               switches::kDisableAccountConsistency)
1440   },
1441   {
1442     "enable-fast-user-switching",
1443     IDS_FLAGS_ENABLE_FAST_USER_SWITCHING_NAME,
1444     IDS_FLAGS_ENABLE_FAST_USER_SWITCHING_DESCRIPTION,
1445     kOsMac | kOsWin | kOsLinux,
1446     SINGLE_VALUE_TYPE(switches::kFastUserSwitching)
1447   },
1448   {
1449     "enable-new-avatar-menu",
1450     IDS_FLAGS_ENABLE_NEW_AVATAR_MENU_NAME,
1451     IDS_FLAGS_ENABLE_NEW_AVATAR_MENU_DESCRIPTION,
1452     kOsMac | kOsWin | kOsLinux,
1453     SINGLE_VALUE_TYPE(switches::kNewAvatarMenu)
1454   },
1455   {
1456     "enable-web-based-signin",
1457     IDS_FLAGS_ENABLE_WEB_BASED_SIGNIN_NAME,
1458     IDS_FLAGS_ENABLE_WEB_BASED_SIGNIN_DESCRIPTION,
1459     kOsMac | kOsWin | kOsLinux,
1460     SINGLE_VALUE_TYPE(switches::kEnableWebBasedSignin)
1461   },
1462   {
1463     "enable-google-profile-info",
1464     IDS_FLAGS_ENABLE_GOOGLE_PROFILE_INFO_NAME,
1465     IDS_FLAGS_ENABLE_GOOGLE_PROFILE_INFO_DESCRIPTION,
1466     kOsMac | kOsWin | kOsLinux,
1467     SINGLE_VALUE_TYPE(switches::kGoogleProfileInfo)
1468   },
1469   {
1470     "reset-app-list-install-state",
1471     IDS_FLAGS_RESET_APP_LIST_INSTALL_STATE_NAME,
1472     IDS_FLAGS_RESET_APP_LIST_INSTALL_STATE_DESCRIPTION,
1473     kOsMac | kOsWin | kOsLinux,
1474     SINGLE_VALUE_TYPE(switches::kResetAppListInstallState)
1475   },
1476 #if defined(ENABLE_APP_LIST)
1477 #if defined(OS_LINUX)
1478   {
1479     // This is compiled out on non-Linux platforms because otherwise it would be
1480     // visible on Win/Mac/CrOS but not on Linux GTK, which would be confusing.
1481     // TODO(mgiuca): Remove the #if when Aura is the default on Linux.
1482     "enable-app-list",
1483     IDS_FLAGS_ENABLE_APP_LIST_NAME,
1484     IDS_FLAGS_ENABLE_APP_LIST_DESCRIPTION,
1485     kOsLinux,
1486     SINGLE_VALUE_TYPE(switches::kEnableAppList)
1487   },
1488 #endif
1489   {
1490     "enable-app-view",
1491     IDS_FLAGS_ENABLE_APP_VIEW_NAME,
1492     IDS_FLAGS_ENABLE_APP_VIEW_DESCRIPTION,
1493     kOsAll,
1494     SINGLE_VALUE_TYPE(switches::kEnableAppView)
1495   },
1496   {
1497     "disable-app-list-app-info",
1498     IDS_FLAGS_DISABLE_APP_INFO_IN_APP_LIST,
1499     IDS_FLAGS_DISABLE_APP_INFO_IN_APP_LIST_DESCRIPTION,
1500     kOsLinux | kOsWin | kOsCrOS,
1501     SINGLE_VALUE_TYPE(app_list::switches::kDisableAppInfo)
1502   },
1503   {
1504     "enable-drive-apps-in-app-list",
1505     IDS_FLAGS_ENABLE_DRIVE_APPS_IN_APP_LIST_NAME,
1506     IDS_FLAGS_ENABLE_DRIVE_APPS_IN_APP_LIST_DESCRIPTION,
1507     kOsDesktop,
1508     SINGLE_VALUE_TYPE(app_list::switches::kEnableDriveAppsInAppList)
1509   },
1510 #endif
1511 #if defined(OS_ANDROID)
1512   {
1513     "enable-accessibility-tab-switcher",
1514     IDS_FLAGS_ENABLE_ACCESSIBILITY_TAB_SWITCHER_NAME,
1515     IDS_FLAGS_ENABLE_ACCESSIBILITY_TAB_SWITCHER_DESCRIPTION,
1516     kOsAndroid,
1517     SINGLE_VALUE_TYPE(switches::kEnableAccessibilityTabSwitcher)
1518   },
1519   {
1520     // TODO(dmazzoni): remove this flag when native android accessibility
1521     // ships in the stable channel. http://crbug.com/356775
1522     "enable-accessibility-script-injection",
1523     IDS_FLAGS_ENABLE_ACCESSIBILITY_SCRIPT_INJECTION_NAME,
1524     IDS_FLAGS_ENABLE_ACCESSIBILITY_SCRIPT_INJECTION_DESCRIPTION,
1525     kOsAndroid,
1526     // Java-only switch: ContentSwitches.ENABLE_ACCESSIBILITY_SCRIPT_INJECTION.
1527     SINGLE_VALUE_TYPE("enable-accessibility-script-injection")
1528   },
1529 #endif
1530   {
1531     "enable-one-copy",
1532     IDS_FLAGS_ONE_COPY_NAME,
1533     IDS_FLAGS_ONE_COPY_DESCRIPTION,
1534     kOsAll,
1535     SINGLE_VALUE_TYPE(switches::kEnableOneCopy)
1536   },
1537   {
1538     "enable-zero-copy",
1539     IDS_FLAGS_ZERO_COPY_NAME,
1540     IDS_FLAGS_ZERO_COPY_DESCRIPTION,
1541     kOsAll,
1542     MULTI_VALUE_TYPE(kZeroCopyChoices)
1543   },
1544 #if defined(OS_CHROMEOS)
1545   {
1546     "enable-first-run-ui-transitions",
1547     IDS_FLAGS_ENABLE_FIRST_RUN_UI_TRANSITIONS_NAME,
1548     IDS_FLAGS_ENABLE_FIRST_RUN_UI_TRANSITIONS_DESCRIPTION,
1549     kOsCrOS,
1550     SINGLE_VALUE_TYPE(chromeos::switches::kEnableFirstRunUITransitions)
1551   },
1552 #endif
1553   {
1554     "enable-streamlined-hosted-apps",
1555     IDS_FLAGS_ENABLE_STREAMLINED_HOSTED_APPS_NAME,
1556     IDS_FLAGS_ENABLE_STREAMLINED_HOSTED_APPS_DESCRIPTION,
1557     kOsWin | kOsCrOS | kOsLinux,
1558     SINGLE_VALUE_TYPE(switches::kEnableStreamlinedHostedApps)
1559   },
1560   {
1561     "enable-prominent-url-app-flow",
1562     IDS_FLAGS_ENABLE_PROMINENT_URL_APP_FLOW_NAME,
1563     IDS_FLAGS_ENABLE_PROMINENT_URL_APP_FLOW_DESCRIPTION,
1564     kOsWin | kOsCrOS | kOsLinux,
1565     SINGLE_VALUE_TYPE(switches::kEnableProminentURLAppFlow)
1566   },
1567   {
1568     "enable-ephemeral-apps",
1569     IDS_FLAGS_ENABLE_EPHEMERAL_APPS_NAME,
1570     IDS_FLAGS_ENABLE_EPHEMERAL_APPS_DESCRIPTION,
1571     kOsAll,
1572     SINGLE_VALUE_TYPE(switches::kEnableEphemeralApps)
1573   },
1574   {
1575     "enable-linkable-ephemeral-apps",
1576     IDS_FLAGS_ENABLE_LINKABLE_EPHEMERAL_APPS_NAME,
1577     IDS_FLAGS_ENABLE_LINKABLE_EPHEMERAL_APPS_DESCRIPTION,
1578     kOsAll,
1579     SINGLE_VALUE_TYPE(switches::kEnableLinkableEphemeralApps)
1580   },
1581   {
1582     "enable-service-worker-sync",
1583     IDS_FLAGS_ENABLE_SERVICE_WORKER_SYNC_NAME,
1584     IDS_FLAGS_ENABLE_SERVICE_WORKER_SYNC_DESCRIPTION,
1585     kOsAll,
1586     SINGLE_VALUE_TYPE(switches::kEnableServiceWorkerSync)
1587   },
1588 #if defined(OS_ANDROID)
1589   {
1590     "disable-click-delay",
1591     IDS_FLAGS_DISABLE_CLICK_DELAY_NAME,
1592     IDS_FLAGS_DISABLE_CLICK_DELAY_DESCRIPTION,
1593     kOsAndroid,
1594     // Java-only switch: CommandLine.DISABLE_CLICK_DELAY
1595     SINGLE_VALUE_TYPE("disable-click-delay")
1596   },
1597 #endif
1598 #if defined(OS_MACOSX)
1599   {
1600     "enable-translate-new-ux",
1601     IDS_FLAGS_ENABLE_TRANSLATE_NEW_UX_NAME,
1602     IDS_FLAGS_ENABLE_TRANSLATE_NEW_UX_DESCRIPTION,
1603     kOsMac,
1604     SINGLE_VALUE_TYPE(switches::kEnableTranslateNewUX)
1605   },
1606 #endif
1607 #if defined(TOOLKIT_VIEWS)
1608   {
1609     "disable-views-rect-based-targeting",  // FLAGS:RECORD_UMA
1610     IDS_FLAGS_DISABLE_VIEWS_RECT_BASED_TARGETING_NAME,
1611     IDS_FLAGS_DISABLE_VIEWS_RECT_BASED_TARGETING_DESCRIPTION,
1612     kOsCrOS | kOsWin | kOsLinux,
1613     SINGLE_VALUE_TYPE(views::switches::kDisableViewsRectBasedTargeting)
1614   },
1615 #endif
1616   {
1617     "enable-apps-show-on-first-paint",
1618     IDS_FLAGS_ENABLE_APPS_SHOW_ON_FIRST_PAINT_NAME,
1619     IDS_FLAGS_ENABLE_APPS_SHOW_ON_FIRST_PAINT_DESCRIPTION,
1620     kOsDesktop,
1621     SINGLE_VALUE_TYPE(switches::kEnableAppsShowOnFirstPaint)
1622   },
1623   {
1624     "enhanced-bookmarks-experiment",
1625     IDS_FLAGS_ENABLE_ENHANCED_BOOKMARKS_NAME,
1626     IDS_FLAGS_ENABLE_ENHANCED_BOOKMARKS_DESCRIPTION,
1627     kOsDesktop,
1628     ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(
1629         switches::kEnhancedBookmarksExperiment, "1",
1630         switches::kEnhancedBookmarksExperiment, "0")
1631   },
1632   {
1633     "manual-enhanced-bookmarks",
1634     IDS_FLAGS_ENABLE_ENHANCED_BOOKMARKS_NAME,
1635     IDS_FLAGS_ENABLE_ENHANCED_BOOKMARKS_DESCRIPTION,
1636     kOsDesktop,
1637     SINGLE_VALUE_TYPE(switches::kManualEnhancedBookmarks)
1638   },
1639   {
1640     "manual-enhanced-bookmarks-optout",
1641     IDS_FLAGS_ENABLE_ENHANCED_BOOKMARKS_NAME,
1642     IDS_FLAGS_ENABLE_ENHANCED_BOOKMARKS_DESCRIPTION,
1643     kOsDesktop,
1644     SINGLE_VALUE_TYPE(switches::kManualEnhancedBookmarksOptout)
1645   },
1646 #if defined(OS_ANDROID)
1647   {
1648     "enable-zero-suggest-experiment",
1649     IDS_FLAGS_ZERO_SUGGEST_EXPERIMENT_NAME,
1650     IDS_FLAGS_ZERO_SUGGEST_EXPERIMENT_DESCRIPTION,
1651     kOsAndroid,
1652     MULTI_VALUE_TYPE(kZeroSuggestExperimentsChoices)
1653   },
1654 #endif
1655   {
1656     "num-raster-threads",
1657     IDS_FLAGS_NUM_RASTER_THREADS_NAME,
1658     IDS_FLAGS_NUM_RASTER_THREADS_DESCRIPTION,
1659     kOsAll,
1660     MULTI_VALUE_TYPE(kNumRasterThreadsChoices)
1661   },
1662   {
1663     "origin-chip-in-omnibox",
1664     IDS_FLAGS_ORIGIN_CHIP_NAME,
1665     IDS_FLAGS_ORIGIN_CHIP_DESCRIPTION,
1666     kOsCrOS | kOsMac | kOsWin | kOsLinux,
1667     MULTI_VALUE_TYPE(kOriginChipChoices)
1668   },
1669   {
1670     "search-button-in-omnibox",
1671     IDS_FLAGS_SEARCH_BUTTON_IN_OMNIBOX_NAME,
1672     IDS_FLAGS_SEARCH_BUTTON_IN_OMNIBOX_DESCRIPTION,
1673     kOsCrOS | kOsMac | kOsWin | kOsLinux,
1674     MULTI_VALUE_TYPE(kSearchButtonInOmniboxChoices)
1675   },
1676   {
1677     "disable-ignore-autocomplete-off",
1678     IDS_FLAGS_DISABLE_IGNORE_AUTOCOMPLETE_OFF_NAME,
1679     IDS_FLAGS_DISABLE_IGNORE_AUTOCOMPLETE_OFF_DESCRIPTION,
1680     kOsAll,
1681     SINGLE_VALUE_TYPE(autofill::switches::kDisableIgnoreAutocompleteOff)
1682   },
1683   {
1684     "enable-permissions-bubbles",
1685     IDS_FLAGS_ENABLE_PERMISSIONS_BUBBLES_NAME,
1686     IDS_FLAGS_ENABLE_PERMISSIONS_BUBBLES_DESCRIPTION,
1687     kOsCrOS | kOsMac | kOsWin | kOsLinux,
1688     ENABLE_DISABLE_VALUE_TYPE(switches::kEnablePermissionsBubbles,
1689                               switches::kDisablePermissionsBubbles)
1690   },
1691   {
1692     "enable-session-crashed-bubble",
1693     IDS_FLAGS_ENABLE_SESSION_CRASHED_BUBBLE_NAME,
1694     IDS_FLAGS_ENABLE_SESSION_CRASHED_BUBBLE_DESCRIPTION,
1695     kOsWin | kOsLinux,
1696     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSessionCrashedBubble,
1697                               switches::kDisableSessionCrashedBubble)
1698   },
1699   {
1700     "out-of-process-pdf",
1701     IDS_FLAGS_OUT_OF_PROCESS_PDF_NAME,
1702     IDS_FLAGS_OUT_OF_PROCESS_PDF_DESCRIPTION,
1703     kOsDesktop,
1704     SINGLE_VALUE_TYPE(switches::kOutOfProcessPdf)
1705   },
1706 #if defined(OS_ANDROID)
1707   {
1708     "enable-fast-text-autosizing",
1709     IDS_FLAGS_ENABLE_FAST_TEXT_AUTOSIZING_NAME,
1710     IDS_FLAGS_ENABLE_FAST_TEXT_AUTOSIZING_DESCRIPTION,
1711     kOsAndroid,
1712     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableFastTextAutosizing,
1713                               switches::kDisableFastTextAutosizing)
1714   },
1715   {
1716     "disable-cast",
1717     IDS_FLAGS_DISABLE_CAST_NAME,
1718     IDS_FLAGS_DISABLE_CAST_DESCRIPTION,
1719     kOsAndroid,
1720     SINGLE_VALUE_TYPE(switches::kDisableCast)
1721   },
1722   {
1723     "prefetch-search-results",
1724     IDS_FLAGS_PREFETCH_SEARCH_RESULTS_NAME,
1725     IDS_FLAGS_PREFETCH_SEARCH_RESULTS_DESCRIPTION,
1726     kOsAndroid,
1727     SINGLE_VALUE_TYPE(switches::kPrefetchSearchResults)
1728   },
1729 #endif
1730 #if defined(ENABLE_APP_LIST)
1731   {
1732     "enable-experimental-app-list",
1733     IDS_FLAGS_ENABLE_EXPERIMENTAL_APP_LIST_NAME,
1734     IDS_FLAGS_ENABLE_EXPERIMENTAL_APP_LIST_DESCRIPTION,
1735     kOsWin | kOsLinux | kOsCrOS,
1736     SINGLE_VALUE_TYPE(app_list::switches::kEnableExperimentalAppList)
1737   },
1738   {
1739     "enable-centered-app-list",
1740     IDS_FLAGS_ENABLE_CENTERED_APP_LIST_NAME,
1741     IDS_FLAGS_ENABLE_CENTERED_APP_LIST_DESCRIPTION,
1742     kOsWin | kOsLinux | kOsCrOS,
1743     SINGLE_VALUE_TYPE(app_list::switches::kEnableCenteredAppList)
1744   },
1745 #endif
1746   {
1747     "touch-scrolling-mode",
1748     IDS_FLAGS_TOUCH_SCROLLING_MODE_NAME,
1749     IDS_FLAGS_TOUCH_SCROLLING_MODE_DESCRIPTION,
1750     kOsWin | kOsLinux | kOsCrOS | kOsAndroid,
1751     MULTI_VALUE_TYPE(kTouchScrollingModeChoices)
1752   },
1753   {
1754     "bleeding-edge-renderer-mode",
1755     IDS_FLAGS_BLEEDING_RENDERER_NAME,
1756     IDS_FLAGS_BLEEDING_RENDERER_DESCRIPTION,
1757     kOsAndroid,
1758     SINGLE_VALUE_TYPE(switches::kEnableBleedingEdgeRenderingFastPaths)
1759   },
1760   {
1761     "enable-settings-window",
1762     IDS_FLAGS_ENABLE_SETTINGS_WINDOW_NAME,
1763     IDS_FLAGS_ENABLE_SETTINGS_WINDOW_DESCRIPTION,
1764     kOsDesktop,
1765     MULTI_VALUE_TYPE(kEnableSettingsWindowChoices)
1766   },
1767 #if defined(OS_ANDROID)
1768   {
1769     "enable-instant-search-clicks",
1770     IDS_FLAGS_ENABLE_INSTANT_SEARCH_CLICKS_NAME,
1771     IDS_FLAGS_ENABLE_INSTANT_SEARCH_CLICKS_DESCRIPTION,
1772     kOsAndroid,
1773     SINGLE_VALUE_TYPE(switches::kEnableInstantSearchClicks)
1774   },
1775 #endif
1776   {
1777     "enable-save-password-bubble",
1778     IDS_FLAGS_ENABLE_SAVE_PASSWORD_BUBBLE_NAME,
1779     IDS_FLAGS_ENABLE_SAVE_PASSWORD_BUBBLE_DESCRIPTION,
1780     kOsWin | kOsLinux | kOsCrOS,
1781     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableSavePasswordBubble,
1782                               switches::kDisableSavePasswordBubble)
1783   },
1784 #if defined(GOOGLE_CHROME_BUILD)
1785   {
1786     "enable-easy-unlock",
1787     IDS_FLAGS_ENABLE_EASY_UNLOCK_NAME,
1788     IDS_FLAGS_ENABLE_EASY_UNLOCK_DESCRIPTION,
1789     kOsCrOS,
1790     SINGLE_VALUE_TYPE(switches::kEnableEasyUnlock)
1791   },
1792 #endif
1793 #if defined(OS_CHROMEOS)
1794   {
1795     "enable-filemanager-mtp",
1796     IDS_FLAGS_ENABLE_FILE_MANAGER_MTP_NAME,
1797     IDS_FLAGS_ENABLE_FILE_MANAGER_MTP_DESCRIPTION,
1798     kOsCrOS,
1799     MULTI_VALUE_TYPE(kEnableFileManagerMTPChoices)
1800   },
1801 #endif
1802   // TODO(tyoshino): Remove this temporary flag and command line switch. See
1803   // crbug.com/366483 for the target milestone.
1804   {
1805     "allow-insecure-websocket-from-https-origin",
1806     IDS_FLAGS_ALLOW_INSECURE_WEBSOCKET_FROM_HTTPS_ORIGIN_NAME,
1807     IDS_FLAGS_ALLOW_INSECURE_WEBSOCKET_FROM_HTTPS_ORIGIN_DESCRIPTION,
1808     kOsAll,
1809     SINGLE_VALUE_TYPE(switches::kAllowInsecureWebSocketFromHttpsOrigin)
1810   },
1811   {
1812     "enable-apps-file-associations",
1813     IDS_FLAGS_ENABLE_APPS_FILE_ASSOCIATIONS_NAME,
1814     IDS_FLAGS_ENABLE_APPS_FILE_ASSOCIATIONS_DESCRIPTION,
1815     kOsMac,
1816     SINGLE_VALUE_TYPE(switches::kEnableAppsFileAssociations)
1817   },
1818 #if defined(OS_ANDROID)
1819   {
1820     "enable-embeddedsearch-api",
1821     IDS_FLAGS_ENABLE_EMBEDDEDSEARCH_API_NAME,
1822     IDS_FLAGS_ENABLE_EMBEDDEDSEARCH_API_DESCRIPTION,
1823     kOsAndroid,
1824     SINGLE_VALUE_TYPE(switches::kEnableEmbeddedSearchAPI)
1825   },
1826   {
1827     "enable-app-install-alerts",
1828     IDS_FLAGS_ENABLE_APP_INSTALL_ALERTS_NAME,
1829     IDS_FLAGS_ENABLE_APP_INSTALL_ALERTS_DESCRIPTION,
1830     kOsAndroid,
1831     SINGLE_VALUE_TYPE(switches::kEnableAppInstallAlerts)
1832   },
1833 #endif
1834   {
1835     "distance-field-text",
1836     IDS_FLAGS_DISTANCE_FIELD_TEXT_NAME,
1837     IDS_FLAGS_DISTANCE_FIELD_TEXT_DESCRIPTION,
1838     kOsAll,
1839     MULTI_VALUE_TYPE(kDistanceFieldTextChoices)
1840   },
1841   {
1842     "extension-content-verification",
1843     IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_NAME,
1844     IDS_FLAGS_EXTENSION_CONTENT_VERIFICATION_DESCRIPTION,
1845     kOsDesktop,
1846     MULTI_VALUE_TYPE(kExtensionContentVerificationChoices)
1847   },
1848 #if defined(USE_AURA)
1849   {
1850     "text-input-focus-manager",
1851     IDS_FLAGS_TEXT_INPUT_FOCUS_MANAGER_NAME,
1852     IDS_FLAGS_TEXT_INPUT_FOCUS_MANAGER_DESCRIPTION,
1853     kOsCrOS | kOsLinux | kOsWin,
1854     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableTextInputFocusManager,
1855                               switches::kDisableTextInputFocusManager)
1856   },
1857 #endif
1858   {
1859     "extension-active-script-permission",
1860     IDS_FLAGS_USER_CONSENT_FOR_EXTENSION_SCRIPTS_NAME,
1861     IDS_FLAGS_USER_CONSENT_FOR_EXTENSION_SCRIPTS_DESCRIPTION,
1862     kOsAll,
1863     SINGLE_VALUE_TYPE(extensions::switches::kEnableScriptsRequireAction)
1864   },
1865   {
1866     "harfbuzz-rendertext",
1867     IDS_FLAGS_HARFBUZZ_RENDERTEXT_NAME,
1868     IDS_FLAGS_HARFBUZZ_RENDERTEXT_DESCRIPTION,
1869     kOsDesktop,
1870     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableHarfBuzzRenderText,
1871                               switches::kDisableHarfBuzzRenderText)
1872   },
1873 #if defined(OS_ANDROID)
1874   {
1875     "answers-in-suggest",
1876     IDS_FLAGS_ENABLE_ANSWERS_IN_SUGGEST_NAME,
1877     IDS_FLAGS_ENABLE_ANSWERS_IN_SUGGEST_DESCRIPTION,
1878     kOsAndroid,
1879     MULTI_VALUE_TYPE(kAnswersInSuggestChoices)
1880   },
1881 #endif
1882   {
1883     "ssl-interstitial-version",
1884     IDS_FLAGS_SSL_INTERSTITIAL_TRIAL_NAME,
1885     IDS_FLAGS_SSL_INTERSTITIAL_TRIAL_DESCRIPTION,
1886     kOsAll,
1887     MULTI_VALUE_TYPE(kSSLInterstitialVersions)
1888   },
1889   {
1890     "malware-interstitial-version",
1891     IDS_FLAGS_MALWARE_INTERSTITIAL_TRIAL_NAME,
1892     IDS_FLAGS_MALWARE_INTERSTITIAL_TRIAL_DESCRIPTION,
1893     kOsAll,
1894     MULTI_VALUE_TYPE(kMalwareInterstitialVersions)
1895   },
1896 #if defined(OS_ANDROID)
1897   {
1898     "enable-data-reduction-proxy-dev",
1899     IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_DEV_NAME,
1900     IDS_FLAGS_ENABLE_DATA_REDUCTION_PROXY_DEV_DESCRIPTION,
1901     kOsAndroid,
1902     ENABLE_DISABLE_VALUE_TYPE(
1903         data_reduction_proxy::switches::kEnableDataReductionProxyDev,
1904         data_reduction_proxy::switches::kDisableDataReductionProxyDev)
1905   },
1906 #endif
1907 #if defined(OS_CHROMEOS)
1908   {
1909     "enable-ok-google-voice-search",
1910     IDS_FLAGS_OK_GOOGLE_NAME,
1911     IDS_FLAGS_OK_GOOGLE_DESCRIPTION,
1912     kOsCrOS,
1913     SINGLE_VALUE_TYPE(chromeos::switches::kEnableOkGoogleVoiceSearch)
1914   },
1915 #endif
1916   {
1917     "enable-embedded-extension-options",
1918     IDS_FLAGS_ENABLE_EMBEDDED_EXTENSION_OPTIONS_NAME,
1919     IDS_FLAGS_ENABLE_EMBEDDED_EXTENSION_OPTIONS_DESCRIPTION,
1920     kOsDesktop,
1921     SINGLE_VALUE_TYPE(extensions::switches::kEnableEmbeddedExtensionOptions)
1922   },
1923   {
1924     "enable-website-settings-manager",
1925     IDS_FLAGS_ENABLE_WEBSITE_SETTINGS_NAME,
1926     IDS_FLAGS_ENABLE_WEBSITE_SETTINGS_DESCRIPTION,
1927     kOsDesktop,
1928     SINGLE_VALUE_TYPE(switches::kEnableWebsiteSettingsManager)
1929   },
1930 };
1931
1932 const Experiment* experiments = kExperiments;
1933 size_t num_experiments = arraysize(kExperiments);
1934
1935 // Stores and encapsulates the little state that about:flags has.
1936 class FlagsState {
1937  public:
1938   FlagsState() : needs_restart_(false) {}
1939   void ConvertFlagsToSwitches(FlagsStorage* flags_storage,
1940                               CommandLine* command_line,
1941                               SentinelsMode sentinels);
1942   bool IsRestartNeededToCommitChanges();
1943   void SetExperimentEnabled(
1944       FlagsStorage* flags_storage,
1945       const std::string& internal_name,
1946       bool enable);
1947   void RemoveFlagsSwitches(
1948       std::map<std::string, CommandLine::StringType>* switch_list);
1949   void ResetAllFlags(FlagsStorage* flags_storage);
1950   void reset();
1951
1952   // Returns the singleton instance of this class
1953   static FlagsState* GetInstance() {
1954     return Singleton<FlagsState>::get();
1955   }
1956
1957  private:
1958   bool needs_restart_;
1959   std::map<std::string, std::string> flags_switches_;
1960
1961   DISALLOW_COPY_AND_ASSIGN(FlagsState);
1962 };
1963
1964 // Adds the internal names for the specified experiment to |names|.
1965 void AddInternalName(const Experiment& e, std::set<std::string>* names) {
1966   if (e.type == Experiment::SINGLE_VALUE) {
1967     names->insert(e.internal_name);
1968   } else {
1969     DCHECK(e.type == Experiment::MULTI_VALUE ||
1970            e.type == Experiment::ENABLE_DISABLE_VALUE);
1971     for (int i = 0; i < e.num_choices; ++i)
1972       names->insert(e.NameForChoice(i));
1973   }
1974 }
1975
1976 // Confirms that an experiment is valid, used in a DCHECK in
1977 // SanitizeList below.
1978 bool ValidateExperiment(const Experiment& e) {
1979   switch (e.type) {
1980     case Experiment::SINGLE_VALUE:
1981       DCHECK_EQ(0, e.num_choices);
1982       DCHECK(!e.choices);
1983       break;
1984     case Experiment::MULTI_VALUE:
1985       DCHECK_GT(e.num_choices, 0);
1986       DCHECK(e.choices);
1987       DCHECK(e.choices[0].command_line_switch);
1988       DCHECK_EQ('\0', e.choices[0].command_line_switch[0]);
1989       break;
1990     case Experiment::ENABLE_DISABLE_VALUE:
1991       DCHECK_EQ(3, e.num_choices);
1992       DCHECK(!e.choices);
1993       DCHECK(e.command_line_switch);
1994       DCHECK(e.command_line_value);
1995       DCHECK(e.disable_command_line_switch);
1996       DCHECK(e.disable_command_line_value);
1997       break;
1998     default:
1999       NOTREACHED();
2000   }
2001   return true;
2002 }
2003
2004 // Removes all experiments from prefs::kEnabledLabsExperiments that are
2005 // unknown, to prevent this list to become very long as experiments are added
2006 // and removed.
2007 void SanitizeList(FlagsStorage* flags_storage) {
2008   std::set<std::string> known_experiments;
2009   for (size_t i = 0; i < num_experiments; ++i) {
2010     DCHECK(ValidateExperiment(experiments[i]));
2011     AddInternalName(experiments[i], &known_experiments);
2012   }
2013
2014   std::set<std::string> enabled_experiments = flags_storage->GetFlags();
2015
2016   std::set<std::string> new_enabled_experiments =
2017       base::STLSetIntersection<std::set<std::string> >(
2018           known_experiments, enabled_experiments);
2019
2020   if (new_enabled_experiments != enabled_experiments)
2021     flags_storage->SetFlags(new_enabled_experiments);
2022 }
2023
2024 void GetSanitizedEnabledFlags(
2025     FlagsStorage* flags_storage, std::set<std::string>* result) {
2026   SanitizeList(flags_storage);
2027   *result = flags_storage->GetFlags();
2028 }
2029
2030 bool SkipConditionalExperiment(const Experiment& experiment) {
2031   if (experiment.internal_name ==
2032       std::string("enhanced-bookmarks-experiment")) {
2033     CommandLine* command_line = CommandLine::ForCurrentProcess();
2034     // Dont't skip experiment if it has non default value.
2035     // It means user selected it.
2036     if (command_line->HasSwitch(switches::kEnhancedBookmarksExperiment))
2037       return false;
2038
2039     return !IsEnhancedBookmarksExperimentEnabled();
2040   }
2041   if ((experiment.internal_name == std::string("manual-enhanced-bookmarks")) ||
2042       (experiment.internal_name ==
2043            std::string("manual-enhanced-bookmarks-optout"))) {
2044     return true;
2045   }
2046
2047 #if defined(OS_ANDROID)
2048   // enable-data-reduction-proxy-dev is only available for the Dev channel.
2049   if (!strcmp("enable-data-reduction-proxy-dev", experiment.internal_name) &&
2050       chrome::VersionInfo::GetChannel() != chrome::VersionInfo::CHANNEL_DEV) {
2051     return true;
2052   }
2053 #endif
2054
2055   return false;
2056 }
2057
2058
2059 // Variant of GetSanitizedEnabledFlags that also removes any flags that aren't
2060 // enabled on the current platform.
2061 void GetSanitizedEnabledFlagsForCurrentPlatform(
2062     FlagsStorage* flags_storage, std::set<std::string>* result) {
2063   GetSanitizedEnabledFlags(flags_storage, result);
2064
2065   // Filter out any experiments that aren't enabled on the current platform.  We
2066   // don't remove these from prefs else syncing to a platform with a different
2067   // set of experiments would be lossy.
2068   std::set<std::string> platform_experiments;
2069   int current_platform = GetCurrentPlatform();
2070   for (size_t i = 0; i < num_experiments; ++i) {
2071     if (experiments[i].supported_platforms & current_platform)
2072       AddInternalName(experiments[i], &platform_experiments);
2073 #if defined(OS_CHROMEOS)
2074     if (experiments[i].supported_platforms & kOsCrOSOwnerOnly)
2075       AddInternalName(experiments[i], &platform_experiments);
2076 #endif
2077   }
2078
2079   std::set<std::string> new_enabled_experiments =
2080       base::STLSetIntersection<std::set<std::string> >(
2081           platform_experiments, *result);
2082
2083   result->swap(new_enabled_experiments);
2084 }
2085
2086 // Returns the Value representing the choice data in the specified experiment.
2087 base::Value* CreateChoiceData(
2088     const Experiment& experiment,
2089     const std::set<std::string>& enabled_experiments) {
2090   DCHECK(experiment.type == Experiment::MULTI_VALUE ||
2091          experiment.type == Experiment::ENABLE_DISABLE_VALUE);
2092   base::ListValue* result = new base::ListValue;
2093   for (int i = 0; i < experiment.num_choices; ++i) {
2094     base::DictionaryValue* value = new base::DictionaryValue;
2095     const std::string name = experiment.NameForChoice(i);
2096     value->SetString("internal_name", name);
2097     value->SetString("description", experiment.DescriptionForChoice(i));
2098     value->SetBoolean("selected", enabled_experiments.count(name) > 0);
2099     result->Append(value);
2100   }
2101   return result;
2102 }
2103
2104 }  // namespace
2105
2106 std::string Experiment::NameForChoice(int index) const {
2107   DCHECK(type == Experiment::MULTI_VALUE ||
2108          type == Experiment::ENABLE_DISABLE_VALUE);
2109   DCHECK_LT(index, num_choices);
2110   return std::string(internal_name) + testing::kMultiSeparator +
2111          base::IntToString(index);
2112 }
2113
2114 base::string16 Experiment::DescriptionForChoice(int index) const {
2115   DCHECK(type == Experiment::MULTI_VALUE ||
2116          type == Experiment::ENABLE_DISABLE_VALUE);
2117   DCHECK_LT(index, num_choices);
2118   int description_id;
2119   if (type == Experiment::ENABLE_DISABLE_VALUE) {
2120     const int kEnableDisableDescriptionIds[] = {
2121       IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT,
2122       IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
2123       IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
2124     };
2125     description_id = kEnableDisableDescriptionIds[index];
2126   } else {
2127     description_id = choices[index].description_id;
2128   }
2129   return l10n_util::GetStringUTF16(description_id);
2130 }
2131
2132 void ConvertFlagsToSwitches(FlagsStorage* flags_storage,
2133                             CommandLine* command_line,
2134                             SentinelsMode sentinels) {
2135   FlagsState::GetInstance()->ConvertFlagsToSwitches(flags_storage,
2136                                                     command_line,
2137                                                     sentinels);
2138 }
2139
2140 bool AreSwitchesIdenticalToCurrentCommandLine(
2141     const CommandLine& new_cmdline, const CommandLine& active_cmdline) {
2142   std::set<CommandLine::StringType> new_flags =
2143       ExtractFlagsFromCommandLine(new_cmdline);
2144   std::set<CommandLine::StringType> active_flags =
2145       ExtractFlagsFromCommandLine(active_cmdline);
2146
2147   // Needed because std::equal doesn't check if the 2nd set is empty.
2148   if (new_flags.size() != active_flags.size())
2149     return false;
2150
2151   return std::equal(new_flags.begin(), new_flags.end(), active_flags.begin());
2152 }
2153
2154 void GetFlagsExperimentsData(FlagsStorage* flags_storage,
2155                              FlagAccess access,
2156                              base::ListValue* supported_experiments,
2157                              base::ListValue* unsupported_experiments) {
2158   std::set<std::string> enabled_experiments;
2159   GetSanitizedEnabledFlags(flags_storage, &enabled_experiments);
2160
2161   int current_platform = GetCurrentPlatform();
2162
2163   for (size_t i = 0; i < num_experiments; ++i) {
2164     const Experiment& experiment = experiments[i];
2165     if (SkipConditionalExperiment(experiment))
2166       continue;
2167
2168     base::DictionaryValue* data = new base::DictionaryValue();
2169     data->SetString("internal_name", experiment.internal_name);
2170     data->SetString("name",
2171                     l10n_util::GetStringUTF16(experiment.visible_name_id));
2172     data->SetString("description",
2173                     l10n_util::GetStringUTF16(
2174                         experiment.visible_description_id));
2175
2176     base::ListValue* supported_platforms = new base::ListValue();
2177     AddOsStrings(experiment.supported_platforms, supported_platforms);
2178     data->Set("supported_platforms", supported_platforms);
2179
2180     switch (experiment.type) {
2181       case Experiment::SINGLE_VALUE:
2182         data->SetBoolean(
2183             "enabled",
2184             enabled_experiments.count(experiment.internal_name) > 0);
2185         break;
2186       case Experiment::MULTI_VALUE:
2187       case Experiment::ENABLE_DISABLE_VALUE:
2188         data->Set("choices", CreateChoiceData(experiment, enabled_experiments));
2189         break;
2190       default:
2191         NOTREACHED();
2192     }
2193
2194     bool supported = (experiment.supported_platforms & current_platform) != 0;
2195 #if defined(OS_CHROMEOS)
2196     if (access == kOwnerAccessToFlags &&
2197         (experiment.supported_platforms & kOsCrOSOwnerOnly) != 0) {
2198       supported = true;
2199     }
2200 #endif
2201     if (supported)
2202       supported_experiments->Append(data);
2203     else
2204       unsupported_experiments->Append(data);
2205   }
2206 }
2207
2208 bool IsRestartNeededToCommitChanges() {
2209   return FlagsState::GetInstance()->IsRestartNeededToCommitChanges();
2210 }
2211
2212 void SetExperimentEnabled(FlagsStorage* flags_storage,
2213                           const std::string& internal_name,
2214                           bool enable) {
2215   FlagsState::GetInstance()->SetExperimentEnabled(flags_storage,
2216                                                   internal_name, enable);
2217 }
2218
2219 void RemoveFlagsSwitches(
2220     std::map<std::string, CommandLine::StringType>* switch_list) {
2221   FlagsState::GetInstance()->RemoveFlagsSwitches(switch_list);
2222 }
2223
2224 void ResetAllFlags(FlagsStorage* flags_storage) {
2225   FlagsState::GetInstance()->ResetAllFlags(flags_storage);
2226 }
2227
2228 int GetCurrentPlatform() {
2229 #if defined(OS_MACOSX)
2230   return kOsMac;
2231 #elif defined(OS_WIN)
2232   return kOsWin;
2233 #elif defined(OS_CHROMEOS)  // Needs to be before the OS_LINUX check.
2234   return kOsCrOS;
2235 #elif defined(OS_LINUX) || defined(OS_OPENBSD)
2236   return kOsLinux;
2237 #elif defined(OS_ANDROID)
2238   return kOsAndroid;
2239 #else
2240 #error Unknown platform
2241 #endif
2242 }
2243
2244 void RecordUMAStatistics(FlagsStorage* flags_storage) {
2245   std::set<std::string> flags = flags_storage->GetFlags();
2246   for (std::set<std::string>::iterator it = flags.begin(); it != flags.end();
2247        ++it) {
2248     std::string action("AboutFlags_");
2249     action += *it;
2250     content::RecordComputedAction(action);
2251   }
2252   // Since flag metrics are recorded every startup, add a tick so that the
2253   // stats can be made meaningful.
2254   if (flags.size())
2255     content::RecordAction(UserMetricsAction("AboutFlags_StartupTick"));
2256   content::RecordAction(UserMetricsAction("StartupTick"));
2257 }
2258
2259 //////////////////////////////////////////////////////////////////////////////
2260 // FlagsState implementation.
2261
2262 namespace {
2263
2264 typedef std::map<std::string, std::pair<std::string, std::string> >
2265     NameToSwitchAndValueMap;
2266
2267 void SetFlagToSwitchMapping(const std::string& key,
2268                             const std::string& switch_name,
2269                             const std::string& switch_value,
2270                             NameToSwitchAndValueMap* name_to_switch_map) {
2271   DCHECK(name_to_switch_map->end() == name_to_switch_map->find(key));
2272   (*name_to_switch_map)[key] = std::make_pair(switch_name, switch_value);
2273 }
2274
2275 void FlagsState::ConvertFlagsToSwitches(FlagsStorage* flags_storage,
2276                                         CommandLine* command_line,
2277                                         SentinelsMode sentinels) {
2278   if (command_line->HasSwitch(switches::kNoExperiments))
2279     return;
2280
2281   std::set<std::string> enabled_experiments;
2282
2283   GetSanitizedEnabledFlagsForCurrentPlatform(flags_storage,
2284                                              &enabled_experiments);
2285
2286   NameToSwitchAndValueMap name_to_switch_map;
2287   for (size_t i = 0; i < num_experiments; ++i) {
2288     const Experiment& e = experiments[i];
2289     if (e.type == Experiment::SINGLE_VALUE) {
2290       SetFlagToSwitchMapping(e.internal_name, e.command_line_switch,
2291                              e.command_line_value, &name_to_switch_map);
2292     } else if (e.type == Experiment::MULTI_VALUE) {
2293       for (int j = 0; j < e.num_choices; ++j) {
2294         SetFlagToSwitchMapping(e.NameForChoice(j),
2295                                e.choices[j].command_line_switch,
2296                                e.choices[j].command_line_value,
2297                                &name_to_switch_map);
2298       }
2299     } else {
2300       DCHECK_EQ(e.type, Experiment::ENABLE_DISABLE_VALUE);
2301       SetFlagToSwitchMapping(e.NameForChoice(0), std::string(), std::string(),
2302                              &name_to_switch_map);
2303       SetFlagToSwitchMapping(e.NameForChoice(1), e.command_line_switch,
2304                              e.command_line_value, &name_to_switch_map);
2305       SetFlagToSwitchMapping(e.NameForChoice(2), e.disable_command_line_switch,
2306                              e.disable_command_line_value, &name_to_switch_map);
2307     }
2308   }
2309
2310   if (sentinels == kAddSentinels) {
2311     command_line->AppendSwitch(switches::kFlagSwitchesBegin);
2312     flags_switches_.insert(
2313         std::pair<std::string, std::string>(switches::kFlagSwitchesBegin,
2314                                             std::string()));
2315   }
2316   for (std::set<std::string>::iterator it = enabled_experiments.begin();
2317        it != enabled_experiments.end();
2318        ++it) {
2319     const std::string& experiment_name = *it;
2320     NameToSwitchAndValueMap::const_iterator name_to_switch_it =
2321         name_to_switch_map.find(experiment_name);
2322     if (name_to_switch_it == name_to_switch_map.end()) {
2323       NOTREACHED();
2324       continue;
2325     }
2326
2327     const std::pair<std::string, std::string>&
2328         switch_and_value_pair = name_to_switch_it->second;
2329
2330     CHECK(!switch_and_value_pair.first.empty());
2331     command_line->AppendSwitchASCII(switch_and_value_pair.first,
2332                                     switch_and_value_pair.second);
2333     flags_switches_[switch_and_value_pair.first] = switch_and_value_pair.second;
2334   }
2335   if (sentinels == kAddSentinels) {
2336     command_line->AppendSwitch(switches::kFlagSwitchesEnd);
2337     flags_switches_.insert(
2338         std::pair<std::string, std::string>(switches::kFlagSwitchesEnd,
2339                                             std::string()));
2340   }
2341 }
2342
2343 bool FlagsState::IsRestartNeededToCommitChanges() {
2344   return needs_restart_;
2345 }
2346
2347 void FlagsState::SetExperimentEnabled(FlagsStorage* flags_storage,
2348                                       const std::string& internal_name,
2349                                       bool enable) {
2350   size_t at_index = internal_name.find(testing::kMultiSeparator);
2351   if (at_index != std::string::npos) {
2352     DCHECK(enable);
2353     // We're being asked to enable a multi-choice experiment. Disable the
2354     // currently selected choice.
2355     DCHECK_NE(at_index, 0u);
2356     const std::string experiment_name = internal_name.substr(0, at_index);
2357     SetExperimentEnabled(flags_storage, experiment_name, false);
2358
2359     // And enable the new choice, if it is not the default first choice.
2360     if (internal_name != experiment_name + "@0") {
2361       std::set<std::string> enabled_experiments;
2362       GetSanitizedEnabledFlags(flags_storage, &enabled_experiments);
2363       needs_restart_ |= enabled_experiments.insert(internal_name).second;
2364       flags_storage->SetFlags(enabled_experiments);
2365     }
2366     return;
2367   }
2368
2369   std::set<std::string> enabled_experiments;
2370   GetSanitizedEnabledFlags(flags_storage, &enabled_experiments);
2371
2372   const Experiment* e = NULL;
2373   for (size_t i = 0; i < num_experiments; ++i) {
2374     if (experiments[i].internal_name == internal_name) {
2375       e = experiments + i;
2376       break;
2377     }
2378   }
2379   DCHECK(e);
2380
2381   if (e->type == Experiment::SINGLE_VALUE) {
2382     if (enable)
2383       needs_restart_ |= enabled_experiments.insert(internal_name).second;
2384     else
2385       needs_restart_ |= (enabled_experiments.erase(internal_name) > 0);
2386   } else {
2387     if (enable) {
2388       // Enable the first choice.
2389       needs_restart_ |= enabled_experiments.insert(e->NameForChoice(0)).second;
2390     } else {
2391       // Find the currently enabled choice and disable it.
2392       for (int i = 0; i < e->num_choices; ++i) {
2393         std::string choice_name = e->NameForChoice(i);
2394         if (enabled_experiments.find(choice_name) !=
2395             enabled_experiments.end()) {
2396           needs_restart_ = true;
2397           enabled_experiments.erase(choice_name);
2398           // Continue on just in case there's a bug and more than one
2399           // experiment for this choice was enabled.
2400         }
2401       }
2402     }
2403   }
2404
2405   flags_storage->SetFlags(enabled_experiments);
2406 }
2407
2408 void FlagsState::RemoveFlagsSwitches(
2409     std::map<std::string, CommandLine::StringType>* switch_list) {
2410   for (std::map<std::string, std::string>::const_iterator
2411            it = flags_switches_.begin(); it != flags_switches_.end(); ++it) {
2412     switch_list->erase(it->first);
2413   }
2414 }
2415
2416 void FlagsState::ResetAllFlags(FlagsStorage* flags_storage) {
2417   needs_restart_ = true;
2418
2419   std::set<std::string> no_experiments;
2420   flags_storage->SetFlags(no_experiments);
2421 }
2422
2423 void FlagsState::reset() {
2424   needs_restart_ = false;
2425   flags_switches_.clear();
2426 }
2427
2428 }  // namespace
2429
2430 namespace testing {
2431
2432 // WARNING: '@' is also used in the html file. If you update this constant you
2433 // also need to update the html file.
2434 const char kMultiSeparator[] = "@";
2435
2436 void ClearState() {
2437   FlagsState::GetInstance()->reset();
2438 }
2439
2440 void SetExperiments(const Experiment* e, size_t count) {
2441   if (!e) {
2442     experiments = kExperiments;
2443     num_experiments = arraysize(kExperiments);
2444   } else {
2445     experiments = e;
2446     num_experiments = count;
2447   }
2448 }
2449
2450 const Experiment* GetExperiments(size_t* count) {
2451   *count = num_experiments;
2452   return experiments;
2453 }
2454
2455 }  // namespace testing
2456
2457 }  // namespace about_flags