chrome/browser/about_flags.cc

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