chrome/browser/prefs/chrome_pref_service_factory.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/prefs/chrome_pref_service_factory.h"
   6
   7 #include <string>
   8 #include <vector>
   9
  10 #include "base/bind.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/files/file_path.h"
  13 #include "base/metrics/field_trial.h"
  14 #include "base/metrics/histogram_macros.h"
  15 #include "base/prefs/default_pref_store.h"
  16 #include "base/prefs/json_pref_store.h"
  17 #include "base/prefs/pref_filter.h"
  18 #include "base/prefs/pref_notifier_impl.h"
  19 #include "base/prefs/pref_registry.h"
  20 #include "base/prefs/pref_registry_simple.h"
  21 #include "base/prefs/pref_service.h"
  22 #include "base/prefs/pref_store.h"
  23 #include "base/prefs/pref_value_store.h"
  24 #include "base/threading/sequenced_worker_pool.h"
  25 #include "base/time/time.h"
  26 #include "base/trace_event/trace_event.h"
  27 #include "chrome/browser/browser_process.h"
  28 #include "chrome/browser/prefs/command_line_pref_store.h"
  29 #include "chrome/browser/prefs/pref_model_associator.h"
  30 #include "chrome/browser/prefs/pref_service_syncable.h"
  31 #include "chrome/browser/prefs/pref_service_syncable_factory.h"
  32 #include "chrome/browser/prefs/profile_pref_store_manager.h"
  33 #include "chrome/browser/profiles/file_path_verifier_win.h"
  34 #include "chrome/browser/profiles/profile.h"
  35 #include "chrome/browser/sync/glue/sync_start_util.h"
  36 #include "chrome/browser/ui/profile_error_dialog.h"
  37 #include "chrome/common/chrome_constants.h"
  38 #include "chrome/common/pref_names.h"
  39 #include "chrome/grit/chromium_strings.h"
  40 #include "chrome/grit/generated_resources.h"
  41 #include "components/component_updater/pref_names.h"
  42 #include "components/pref_registry/pref_registry_syncable.h"
  43 #include "components/search_engines/default_search_manager.h"
  44 #include "components/search_engines/default_search_pref_migration.h"
  45 #include "components/search_engines/search_engines_pref_names.h"
  46 #include "components/sync_driver/pref_names.h"
  47 #include "components/user_prefs/tracked/pref_names.h"
  48 #include "content/public/browser/browser_context.h"
  49 #include "content/public/browser/browser_thread.h"
  50 #include "grit/browser_resources.h"
  51 #include "sync/internal_api/public/base/model_type.h"
  52 #include "ui/base/resource/resource_bundle.h"
  53
  54 #if defined(ENABLE_CONFIGURATION_POLICY)
  55 #include "components/policy/core/browser/browser_policy_connector.h"
  56 #include "components/policy/core/browser/configuration_policy_pref_store.h"
  57 #include "components/policy/core/common/policy_types.h"
  58 #endif
  59
  60 #if defined(ENABLE_EXTENSIONS)
  61 #include "extensions/browser/pref_names.h"
  62 #endif
  63
  64 #if defined(ENABLE_SUPERVISED_USERS)
  65 #include "chrome/browser/supervised_user/supervised_user_pref_store.h"
  66 #endif
  67
  68 #if defined(OS_WIN)
  69 #include "base/win/win_util.h"
  70 #if defined(ENABLE_RLZ)
  71 #include "rlz/lib/machine_id.h"
  72 #endif  // defined(ENABLE_RLZ)
  73 #endif  // defined(OS_WIN)
  74
  75 using content::BrowserContext;
  76 using content::BrowserThread;
  77
  78 namespace {
  79
  80 #if defined(OS_WIN)
  81 // Whether we are in testing mode; can be enabled via
  82 // DisableDomainCheckForTesting(). Forces startup checks to ignore the presence
  83 // of a domain when determining the active SettingsEnforcement group.
  84 bool g_disable_domain_check_for_testing = false;
  85 #endif  // OS_WIN
  86
  87 // These preferences must be kept in sync with the TrackedPreference enum in
  88 // tools/metrics/histograms/histograms.xml. To add a new preference, append it
  89 // to the array and add a corresponding value to the histogram enum. Each
  90 // tracked preference must be given a unique reporting ID.
  91 // See CleanupDeprecatedTrackedPreferences() in pref_hash_filter.cc to remove a
  92 // deprecated tracked preference.
  93 const PrefHashFilter::TrackedPreferenceMetadata kTrackedPrefs[] = {
  94   {
  95     0, prefs::kShowHomeButton,
  96     PrefHashFilter::ENFORCE_ON_LOAD,
  97     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
  98     PrefHashFilter::VALUE_IMPERSONAL
  99   },
 100   {
 101     1, prefs::kHomePageIsNewTabPage,
 102     PrefHashFilter::ENFORCE_ON_LOAD,
 103     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 104     PrefHashFilter::VALUE_IMPERSONAL
 105   },
 106   {
 107     2, prefs::kHomePage,
 108     PrefHashFilter::ENFORCE_ON_LOAD,
 109     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 110     PrefHashFilter::VALUE_IMPERSONAL
 111   },
 112   {
 113     3, prefs::kRestoreOnStartup,
 114     PrefHashFilter::ENFORCE_ON_LOAD,
 115     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 116     PrefHashFilter::VALUE_IMPERSONAL
 117   },
 118   {
 119     4, prefs::kURLsToRestoreOnStartup,
 120     PrefHashFilter::ENFORCE_ON_LOAD,
 121     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 122     PrefHashFilter::VALUE_IMPERSONAL
 123   },
 124 #if defined(ENABLE_EXTENSIONS)
 125   {
 126     5, extensions::pref_names::kExtensions,
 127     PrefHashFilter::NO_ENFORCEMENT,
 128     PrefHashFilter::TRACKING_STRATEGY_SPLIT,
 129     PrefHashFilter::VALUE_IMPERSONAL
 130   },
 131 #endif
 132   {
 133     6, prefs::kGoogleServicesLastUsername,
 134     PrefHashFilter::ENFORCE_ON_LOAD,
 135     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 136     PrefHashFilter::VALUE_PERSONAL
 137   },
 138   {
 139     7, prefs::kSearchProviderOverrides,
 140     PrefHashFilter::ENFORCE_ON_LOAD,
 141     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 142     PrefHashFilter::VALUE_IMPERSONAL
 143   },
 144   {
 145     8, prefs::kDefaultSearchProviderSearchURL,
 146     PrefHashFilter::ENFORCE_ON_LOAD,
 147     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 148     PrefHashFilter::VALUE_IMPERSONAL
 149   },
 150   {
 151     9, prefs::kDefaultSearchProviderKeyword,
 152     PrefHashFilter::ENFORCE_ON_LOAD,
 153     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 154     PrefHashFilter::VALUE_IMPERSONAL
 155   },
 156   {
 157     10, prefs::kDefaultSearchProviderName,
 158     PrefHashFilter::ENFORCE_ON_LOAD,
 159     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 160     PrefHashFilter::VALUE_IMPERSONAL
 161   },
 162 #if !defined(OS_ANDROID)
 163   {
 164     11, prefs::kPinnedTabs,
 165     PrefHashFilter::ENFORCE_ON_LOAD,
 166     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 167     PrefHashFilter::VALUE_IMPERSONAL
 168   },
 169   {
 170     13, prefs::kProfileResetPromptMementoInProfilePrefs,
 171     PrefHashFilter::ENFORCE_ON_LOAD,
 172     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 173     PrefHashFilter::VALUE_IMPERSONAL
 174   },
 175 #endif
 176   {
 177     14, DefaultSearchManager::kDefaultSearchProviderDataPrefName,
 178     PrefHashFilter::NO_ENFORCEMENT,
 179     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 180     PrefHashFilter::VALUE_IMPERSONAL
 181   },
 182   {
 183     // Protecting kPreferenceResetTime does two things:
 184     //  1) It ensures this isn't accidently set by someone stomping the pref
 185     //     file.
 186     //  2) More importantly, it declares kPreferenceResetTime as a protected
 187     //     pref which is required for it to be visible when queried via the
 188     //     SegregatedPrefStore. This is because it's written directly in the
 189     //     protected JsonPrefStore by that store's PrefHashFilter if there was
 190     //     a reset in FilterOnLoad and SegregatedPrefStore will not look for it
 191     //     in the protected JsonPrefStore unless it's declared as a protected
 192     //     preference here.
 193     15, user_prefs::kPreferenceResetTime,
 194     PrefHashFilter::ENFORCE_ON_LOAD,
 195     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 196     PrefHashFilter::VALUE_IMPERSONAL
 197   },
 198   {
 199     17, sync_driver::prefs::kSyncRemainingRollbackTries,
 200     PrefHashFilter::ENFORCE_ON_LOAD,
 201     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 202     PrefHashFilter::VALUE_IMPERSONAL
 203   },
 204   {
 205     18, prefs::kSafeBrowsingIncidentsSent,
 206     PrefHashFilter::ENFORCE_ON_LOAD,
 207     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 208     PrefHashFilter::VALUE_IMPERSONAL
 209   },
 210 #if defined(OS_WIN)
 211   {
 212     19, prefs::kSwReporterPromptVersion,
 213     PrefHashFilter::ENFORCE_ON_LOAD,
 214     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 215     PrefHashFilter::VALUE_IMPERSONAL
 216   },
 217 #endif
 218   // This pref is deprecated and will be removed a few releases after M43.
 219   // kGoogleServicesAccountId replaces it.
 220   {
 221     21, prefs::kGoogleServicesUsername,
 222     PrefHashFilter::ENFORCE_ON_LOAD,
 223     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 224     PrefHashFilter::VALUE_PERSONAL
 225   },
 226 #if defined(OS_WIN)
 227   {
 228     22, prefs::kSwReporterPromptSeed,
 229     PrefHashFilter::ENFORCE_ON_LOAD,
 230     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 231     PrefHashFilter::VALUE_IMPERSONAL
 232   },
 233 #endif
 234   {
 235     23, prefs::kGoogleServicesAccountId,
 236     PrefHashFilter::ENFORCE_ON_LOAD,
 237     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 238     PrefHashFilter::VALUE_PERSONAL
 239   },
 240   // See note at top, new items added here also need to be added to
 241   // histograms.xml's TrackedPreference enum.
 242 };
 243
 244 // One more than the last tracked preferences ID above.
 245 const size_t kTrackedPrefsReportingIDsCount =
 246     kTrackedPrefs[arraysize(kTrackedPrefs) - 1].reporting_id + 1;
 247
 248 // Each group enforces a superset of the protection provided by the previous
 249 // one.
 250 enum SettingsEnforcementGroup {
 251   GROUP_NO_ENFORCEMENT,
 252   // Enforce protected settings on profile loads.
 253   GROUP_ENFORCE_ALWAYS,
 254   // Also enforce extension default search.
 255   GROUP_ENFORCE_ALWAYS_WITH_DSE,
 256   // Also enforce extension settings and default search.
 257   GROUP_ENFORCE_ALWAYS_WITH_EXTENSIONS_AND_DSE,
 258   // The default enforcement group contains all protection features.
 259   GROUP_ENFORCE_DEFAULT
 260 };
 261
 262 SettingsEnforcementGroup GetSettingsEnforcementGroup() {
 263 # if defined(OS_WIN)
 264   if (!g_disable_domain_check_for_testing) {
 265     static bool first_call = true;
 266     static const bool is_enrolled_to_domain = base::win::IsEnrolledToDomain();
 267     if (first_call) {
 268       UMA_HISTOGRAM_BOOLEAN("Settings.TrackedPreferencesNoEnforcementOnDomain",
 269                             is_enrolled_to_domain);
 270       first_call = false;
 271     }
 272     if (is_enrolled_to_domain)
 273       return GROUP_NO_ENFORCEMENT;
 274   }
 275 #endif
 276
 277   struct {
 278     const char* group_name;
 279     SettingsEnforcementGroup group;
 280   } static const kEnforcementLevelMap[] = {
 281     { chrome_prefs::internals::kSettingsEnforcementGroupNoEnforcement,
 282       GROUP_NO_ENFORCEMENT },
 283     { chrome_prefs::internals::kSettingsEnforcementGroupEnforceAlways,
 284       GROUP_ENFORCE_ALWAYS },
 285     { chrome_prefs::internals::
 286           kSettingsEnforcementGroupEnforceAlwaysWithDSE,
 287       GROUP_ENFORCE_ALWAYS_WITH_DSE },
 288     { chrome_prefs::internals::
 289           kSettingsEnforcementGroupEnforceAlwaysWithExtensionsAndDSE,
 290       GROUP_ENFORCE_ALWAYS_WITH_EXTENSIONS_AND_DSE },
 291   };
 292
 293   // Use the strongest enforcement setting in the absence of a field trial
 294   // config on Windows. Remember to update the OFFICIAL_BUILD section of
 295   // extension_startup_browsertest.cc and pref_hash_browsertest.cc when updating
 296   // the default value below.
 297   // TODO(gab): Enforce this on all platforms.
 298   SettingsEnforcementGroup enforcement_group =
 299 #if defined(OS_WIN)
 300       GROUP_ENFORCE_DEFAULT;
 301 #else
 302       GROUP_NO_ENFORCEMENT;
 303 #endif
 304   bool group_determined_from_trial = false;
 305   base::FieldTrial* trial =
 306       base::FieldTrialList::Find(
 307           chrome_prefs::internals::kSettingsEnforcementTrialName);
 308   if (trial) {
 309     const std::string& group_name = trial->group_name();
 310     for (size_t i = 0; i < arraysize(kEnforcementLevelMap); ++i) {
 311       if (kEnforcementLevelMap[i].group_name == group_name) {
 312         enforcement_group = kEnforcementLevelMap[i].group;
 313         group_determined_from_trial = true;
 314         break;
 315       }
 316     }
 317   }
 318   UMA_HISTOGRAM_BOOLEAN("Settings.EnforcementGroupDeterminedFromTrial",
 319                         group_determined_from_trial);
 320   return enforcement_group;
 321 }
 322
 323 // Returns the effective preference tracking configuration.
 324 std::vector<PrefHashFilter::TrackedPreferenceMetadata>
 325 GetTrackingConfiguration() {
 326   const SettingsEnforcementGroup enforcement_group =
 327       GetSettingsEnforcementGroup();
 328
 329   std::vector<PrefHashFilter::TrackedPreferenceMetadata> result;
 330   for (size_t i = 0; i < arraysize(kTrackedPrefs); ++i) {
 331     PrefHashFilter::TrackedPreferenceMetadata data = kTrackedPrefs[i];
 332
 333     if (GROUP_NO_ENFORCEMENT == enforcement_group) {
 334       // Remove enforcement for all tracked preferences.
 335       data.enforcement_level = PrefHashFilter::NO_ENFORCEMENT;
 336     }
 337
 338     if (enforcement_group >= GROUP_ENFORCE_ALWAYS_WITH_DSE &&
 339         data.name == DefaultSearchManager::kDefaultSearchProviderDataPrefName) {
 340       // Specifically enable default search settings enforcement.
 341       data.enforcement_level = PrefHashFilter::ENFORCE_ON_LOAD;
 342     }
 343
 344 #if defined(ENABLE_EXTENSIONS)
 345     if (enforcement_group >= GROUP_ENFORCE_ALWAYS_WITH_EXTENSIONS_AND_DSE &&
 346         data.name == extensions::pref_names::kExtensions) {
 347       // Specifically enable extension settings enforcement.
 348       data.enforcement_level = PrefHashFilter::ENFORCE_ON_LOAD;
 349     }
 350 #endif
 351
 352     result.push_back(data);
 353   }
 354   return result;
 355 }
 356
 357 // Shows notifications which correspond to PersistentPrefStore's reading errors.
 358 void HandleReadError(PersistentPrefStore::PrefReadError error) {
 359   // Sample the histogram also for the successful case in order to get a
 360   // baseline on the success rate in addition to the error distribution.
 361   UMA_HISTOGRAM_ENUMERATION("PrefService.ReadError", error,
 362                             PersistentPrefStore::PREF_READ_ERROR_MAX_ENUM);
 363
 364   if (error != PersistentPrefStore::PREF_READ_ERROR_NONE) {
 365 #if !defined(OS_CHROMEOS)
 366     // Failing to load prefs on startup is a bad thing(TM). See bug 38352 for
 367     // an example problem that this can cause.
 368     // Do some diagnosis and try to avoid losing data.
 369     int message_id = 0;
 370     if (error <= PersistentPrefStore::PREF_READ_ERROR_JSON_TYPE) {
 371       message_id = IDS_PREFERENCES_CORRUPT_ERROR;
 372     } else if (error != PersistentPrefStore::PREF_READ_ERROR_NO_FILE) {
 373       message_id = IDS_PREFERENCES_UNREADABLE_ERROR;
 374     }
 375
 376     if (message_id) {
 377       BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
 378                               base::Bind(&ShowProfileErrorDialog,
 379                                          PROFILE_ERROR_PREFERENCES,
 380                                          message_id));
 381     }
 382 #else
 383     // On ChromeOS error screen with message about broken local state
 384     // will be displayed.
 385
 386     // A supplementary error message about broken local state - is included
 387     // in logs and user feedbacks.
 388     if (error != PersistentPrefStore::PREF_READ_ERROR_NONE &&
 389         error != PersistentPrefStore::PREF_READ_ERROR_NO_FILE) {
 390       LOG(ERROR) << "An error happened during prefs loading: " << error;
 391     }
 392 #endif
 393   }
 394 }
 395
 396 scoped_ptr<ProfilePrefStoreManager> CreateProfilePrefStoreManager(
 397     const base::FilePath& profile_path) {
 398   std::string device_id;
 399 #if defined(OS_WIN) && defined(ENABLE_RLZ)
 400   // This is used by
 401   // chrome/browser/extensions/api/music_manager_private/device_id_win.cc
 402   // but that API is private (http://crbug.com/276485) and other platforms are
 403   // not available synchronously.
 404   // As part of improving pref metrics on other platforms we may want to find
 405   // ways to defer preference loading until the device ID can be used.
 406   rlz_lib::GetMachineId(&device_id);
 407 #endif
 408   std::string seed;
 409 #if defined(GOOGLE_CHROME_BUILD)
 410   seed = ResourceBundle::GetSharedInstance().GetRawDataResource(
 411       IDR_PREF_HASH_SEED_BIN).as_string();
 412 #endif
 413   return make_scoped_ptr(new ProfilePrefStoreManager(
 414       profile_path,
 415       GetTrackingConfiguration(),
 416       kTrackedPrefsReportingIDsCount,
 417       seed,
 418       device_id,
 419       g_browser_process->local_state()));
 420 }
 421
 422 void PrepareFactory(
 423     PrefServiceSyncableFactory* factory,
 424     policy::PolicyService* policy_service,
 425     SupervisedUserSettingsService* supervised_user_settings,
 426     scoped_refptr<PersistentPrefStore> user_pref_store,
 427     const scoped_refptr<PrefStore>& extension_prefs,
 428     bool async) {
 429 #if defined(ENABLE_CONFIGURATION_POLICY)
 430   using policy::ConfigurationPolicyPrefStore;
 431   factory->set_managed_prefs(
 432       make_scoped_refptr(new ConfigurationPolicyPrefStore(
 433           policy_service,
 434           g_browser_process->browser_policy_connector()->GetHandlerList(),
 435           policy::POLICY_LEVEL_MANDATORY)));
 436   factory->set_recommended_prefs(
 437       make_scoped_refptr(new ConfigurationPolicyPrefStore(
 438           policy_service,
 439           g_browser_process->browser_policy_connector()->GetHandlerList(),
 440           policy::POLICY_LEVEL_RECOMMENDED)));
 441 #endif  // ENABLE_CONFIGURATION_POLICY
 442
 443 #if defined(ENABLE_SUPERVISED_USERS)
 444   if (supervised_user_settings) {
 445     scoped_refptr<PrefStore> supervised_user_prefs = make_scoped_refptr(
 446         new SupervisedUserPrefStore(supervised_user_settings));
 447     // TODO(bauerb): Temporary CHECK while investigating
 448     // https://crbug.com/425785. Remove when that bug is fixed.
 449     CHECK(async || supervised_user_prefs->IsInitializationComplete());
 450     factory->set_supervised_user_prefs(supervised_user_prefs);
 451   }
 452 #endif
 453
 454   factory->set_async(async);
 455   factory->set_extension_prefs(extension_prefs);
 456   factory->set_command_line_prefs(make_scoped_refptr(
 457       new CommandLinePrefStore(base::CommandLine::ForCurrentProcess())));
 458   factory->set_read_error_callback(base::Bind(&HandleReadError));
 459   factory->set_user_prefs(user_pref_store);
 460 }
 461
 462 }  // namespace
 463
 464 namespace chrome_prefs {
 465
 466 namespace internals {
 467
 468 // Group modifications should be reflected in first_run_browsertest.cc and
 469 // pref_hash_browsertest.cc.
 470 const char kSettingsEnforcementTrialName[] = "SettingsEnforcement";
 471 const char kSettingsEnforcementGroupNoEnforcement[] = "no_enforcement";
 472 const char kSettingsEnforcementGroupEnforceAlways[] = "enforce_always";
 473 const char kSettingsEnforcementGroupEnforceAlwaysWithDSE[] =
 474     "enforce_always_with_dse";
 475 const char kSettingsEnforcementGroupEnforceAlwaysWithExtensionsAndDSE[] =
 476     "enforce_always_with_extensions_and_dse";
 477
 478 }  // namespace internals
 479
 480 scoped_ptr<PrefService> CreateLocalState(
 481     const base::FilePath& pref_filename,
 482     base::SequencedTaskRunner* pref_io_task_runner,
 483     policy::PolicyService* policy_service,
 484     const scoped_refptr<PrefRegistry>& pref_registry,
 485     bool async) {
 486   PrefServiceSyncableFactory factory;
 487   PrepareFactory(
 488       &factory,
 489       policy_service,
 490       NULL,  // supervised_user_settings
 491       new JsonPrefStore(
 492           pref_filename, pref_io_task_runner, scoped_ptr<PrefFilter>()),
 493       NULL,  // extension_prefs
 494       async);
 495   return factory.Create(pref_registry.get());
 496 }
 497
 498 scoped_ptr<PrefServiceSyncable> CreateProfilePrefs(
 499     const base::FilePath& profile_path,
 500     base::SequencedTaskRunner* pref_io_task_runner,
 501     TrackedPreferenceValidationDelegate* validation_delegate,
 502     policy::PolicyService* policy_service,
 503     SupervisedUserSettingsService* supervised_user_settings,
 504     const scoped_refptr<PrefStore>& extension_prefs,
 505     const scoped_refptr<user_prefs::PrefRegistrySyncable>& pref_registry,
 506     bool async) {
 507   TRACE_EVENT0("browser", "chrome_prefs::CreateProfilePrefs");
 508   SCOPED_UMA_HISTOGRAM_TIMER("PrefService.CreateProfilePrefsTime");
 509
 510   // A StartSyncFlare used to kick sync early in case of a reset event. This is
 511   // done since sync may bring back the user's server value post-reset which
 512   // could potentially cause a "settings flash" between the factory default and
 513   // the re-instantiated server value. Starting sync ASAP minimizes the window
 514   // before the server value is re-instantiated (this window can otherwise be
 515   // as long as 10 seconds by default).
 516   const base::Closure start_sync_flare_for_prefs =
 517       base::Bind(sync_start_util::GetFlareForSyncableService(profile_path),
 518                  syncer::PREFERENCES);
 519
 520   PrefServiceSyncableFactory factory;
 521   scoped_refptr<PersistentPrefStore> user_pref_store(
 522       CreateProfilePrefStoreManager(profile_path)
 523           ->CreateProfilePrefStore(pref_io_task_runner,
 524                                    start_sync_flare_for_prefs,
 525                                    validation_delegate));
 526   PrepareFactory(&factory,
 527                  policy_service,
 528                  supervised_user_settings,
 529                  user_pref_store,
 530                  extension_prefs,
 531                  async);
 532   scoped_ptr<PrefServiceSyncable> pref_service =
 533       factory.CreateSyncable(pref_registry.get());
 534
 535   ConfigureDefaultSearchPrefMigrationToDictionaryValue(pref_service.get());
 536
 537   return pref_service.Pass();
 538 }
 539
 540 void SchedulePrefsFilePathVerification(const base::FilePath& profile_path) {
 541 #if defined(OS_WIN)
 542   // Only do prefs file verification on Windows.
 543   const int kVerifyPrefsFileDelaySeconds = 60;
 544   BrowserThread::GetBlockingPool()->PostDelayedTask(
 545       FROM_HERE,
 546       base::Bind(&VerifyPreferencesFile,
 547                  ProfilePrefStoreManager::GetPrefFilePathFromProfilePath(
 548                      profile_path)),
 549       base::TimeDelta::FromSeconds(kVerifyPrefsFileDelaySeconds));
 550 #endif
 551 }
 552
 553 void DisableDomainCheckForTesting() {
 554 #if defined(OS_WIN)
 555   g_disable_domain_check_for_testing = true;
 556 #endif  // OS_WIN
 557 }
 558
 559 bool InitializePrefsFromMasterPrefs(
 560     const base::FilePath& profile_path,
 561     const base::DictionaryValue& master_prefs) {
 562   return CreateProfilePrefStoreManager(profile_path)
 563       ->InitializePrefsFromMasterPrefs(master_prefs);
 564 }
 565
 566 base::Time GetResetTime(Profile* profile) {
 567   return ProfilePrefStoreManager::GetResetTime(profile->GetPrefs());
 568 }
 569
 570 void ClearResetTime(Profile* profile) {
 571   ProfilePrefStoreManager::ClearResetTime(profile->GetPrefs());
 572 }
 573
 574 void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
 575   ProfilePrefStoreManager::RegisterProfilePrefs(registry);
 576 }
 577
 578 void RegisterPrefs(PrefRegistrySimple* registry) {
 579   ProfilePrefStoreManager::RegisterPrefs(registry);
 580 }
 581
 582 }  // namespace chrome_prefs