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/prefs/tracked/pref_hash_filter.h"
  34 #include "chrome/browser/profiles/file_path_verifier_win.h"
  35 #include "chrome/browser/profiles/profile.h"
  36 #include "chrome/browser/search_engines/default_search_pref_migration.h"
  37 #include "chrome/browser/sync/glue/sync_start_util.h"
  38 #include "chrome/browser/ui/profile_error_dialog.h"
  39 #include "chrome/common/chrome_constants.h"
  40 #include "chrome/common/pref_names.h"
  41 #include "chrome/grit/chromium_strings.h"
  42 #include "chrome/grit/generated_resources.h"
  43 #include "components/component_updater/pref_names.h"
  44 #include "components/pref_registry/pref_registry_syncable.h"
  45 #include "components/search_engines/default_search_manager.h"
  46 #include "components/search_engines/search_engines_pref_names.h"
  47 #include "components/sync_driver/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, 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   {
 218     20, prefs::kSwReporterPromptReason,
 219     PrefHashFilter::ENFORCE_ON_LOAD,
 220     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 221     PrefHashFilter::VALUE_IMPERSONAL
 222   },
 223 #endif
 224   {
 225     21, prefs::kGoogleServicesUsername,
 226     PrefHashFilter::ENFORCE_ON_LOAD,
 227     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 228     PrefHashFilter::VALUE_PERSONAL
 229   },
 230 #if defined(OS_WIN)
 231   {
 232     22, prefs::kSwReporterPromptSeed,
 233     PrefHashFilter::ENFORCE_ON_LOAD,
 234     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
 235     PrefHashFilter::VALUE_IMPERSONAL
 236   },
 237 #endif
 238   // See note at top, new items added here also need to be added to
 239   // histograms.xml's TrackedPreference enum.
 240 };
 241
 242 // One more than the last tracked preferences ID above.
 243 const size_t kTrackedPrefsReportingIDsCount =
 244     kTrackedPrefs[arraysize(kTrackedPrefs) - 1].reporting_id + 1;
 245
 246 // Each group enforces a superset of the protection provided by the previous
 247 // one.
 248 enum SettingsEnforcementGroup {
 249   GROUP_NO_ENFORCEMENT,
 250   // Enforce protected settings on profile loads.
 251   GROUP_ENFORCE_ALWAYS,
 252   // Also enforce extension default search.
 253   GROUP_ENFORCE_ALWAYS_WITH_DSE,
 254   // Also enforce extension settings and default search.
 255   GROUP_ENFORCE_ALWAYS_WITH_EXTENSIONS_AND_DSE,
 256   // The default enforcement group contains all protection features.
 257   GROUP_ENFORCE_DEFAULT
 258 };
 259
 260 SettingsEnforcementGroup GetSettingsEnforcementGroup() {
 261 # if defined(OS_WIN)
 262   if (!g_disable_domain_check_for_testing) {
 263     static bool first_call = true;
 264     static const bool is_enrolled_to_domain = base::win::IsEnrolledToDomain();
 265     if (first_call) {
 266       UMA_HISTOGRAM_BOOLEAN("Settings.TrackedPreferencesNoEnforcementOnDomain",
 267                             is_enrolled_to_domain);
 268       first_call = false;
 269     }
 270     if (is_enrolled_to_domain)
 271       return GROUP_NO_ENFORCEMENT;
 272   }
 273 #endif
 274
 275   struct {
 276     const char* group_name;
 277     SettingsEnforcementGroup group;
 278   } static const kEnforcementLevelMap[] = {
 279     { chrome_prefs::internals::kSettingsEnforcementGroupNoEnforcement,
 280       GROUP_NO_ENFORCEMENT },
 281     { chrome_prefs::internals::kSettingsEnforcementGroupEnforceAlways,
 282       GROUP_ENFORCE_ALWAYS },
 283     { chrome_prefs::internals::
 284           kSettingsEnforcementGroupEnforceAlwaysWithDSE,
 285       GROUP_ENFORCE_ALWAYS_WITH_DSE },
 286     { chrome_prefs::internals::
 287           kSettingsEnforcementGroupEnforceAlwaysWithExtensionsAndDSE,
 288       GROUP_ENFORCE_ALWAYS_WITH_EXTENSIONS_AND_DSE },
 289   };
 290
 291   // Use the strongest enforcement setting in the absence of a field trial
 292   // config on Windows. Remember to update the OFFICIAL_BUILD section of
 293   // extension_startup_browsertest.cc and pref_hash_browsertest.cc when updating
 294   // the default value below.
 295   // TODO(gab): Enforce this on all platforms.
 296   SettingsEnforcementGroup enforcement_group =
 297 #if defined(OS_WIN)
 298       GROUP_ENFORCE_DEFAULT;
 299 #else
 300       GROUP_NO_ENFORCEMENT;
 301 #endif
 302   bool group_determined_from_trial = false;
 303   base::FieldTrial* trial =
 304       base::FieldTrialList::Find(
 305           chrome_prefs::internals::kSettingsEnforcementTrialName);
 306   if (trial) {
 307     const std::string& group_name = trial->group_name();
 308     for (size_t i = 0; i < arraysize(kEnforcementLevelMap); ++i) {
 309       if (kEnforcementLevelMap[i].group_name == group_name) {
 310         enforcement_group = kEnforcementLevelMap[i].group;
 311         group_determined_from_trial = true;
 312         break;
 313       }
 314     }
 315   }
 316   UMA_HISTOGRAM_BOOLEAN("Settings.EnforcementGroupDeterminedFromTrial",
 317                         group_determined_from_trial);
 318   return enforcement_group;
 319 }
 320
 321 // Returns the effective preference tracking configuration.
 322 std::vector<PrefHashFilter::TrackedPreferenceMetadata>
 323 GetTrackingConfiguration() {
 324   const SettingsEnforcementGroup enforcement_group =
 325       GetSettingsEnforcementGroup();
 326
 327   std::vector<PrefHashFilter::TrackedPreferenceMetadata> result;
 328   for (size_t i = 0; i < arraysize(kTrackedPrefs); ++i) {
 329     PrefHashFilter::TrackedPreferenceMetadata data = kTrackedPrefs[i];
 330
 331     if (GROUP_NO_ENFORCEMENT == enforcement_group) {
 332       // Remove enforcement for all tracked preferences.
 333       data.enforcement_level = PrefHashFilter::NO_ENFORCEMENT;
 334     }
 335
 336     if (enforcement_group >= GROUP_ENFORCE_ALWAYS_WITH_DSE &&
 337         data.name == DefaultSearchManager::kDefaultSearchProviderDataPrefName) {
 338       // Specifically enable default search settings enforcement.
 339       data.enforcement_level = PrefHashFilter::ENFORCE_ON_LOAD;
 340     }
 341
 342 #if defined(ENABLE_EXTENSIONS)
 343     if (enforcement_group >= GROUP_ENFORCE_ALWAYS_WITH_EXTENSIONS_AND_DSE &&
 344         data.name == extensions::pref_names::kExtensions) {
 345       // Specifically enable extension settings enforcement.
 346       data.enforcement_level = PrefHashFilter::ENFORCE_ON_LOAD;
 347     }
 348 #endif
 349
 350     result.push_back(data);
 351   }
 352   return result;
 353 }
 354
 355 // Shows notifications which correspond to PersistentPrefStore's reading errors.
 356 void HandleReadError(PersistentPrefStore::PrefReadError error) {
 357   // Sample the histogram also for the successful case in order to get a
 358   // baseline on the success rate in addition to the error distribution.
 359   UMA_HISTOGRAM_ENUMERATION("PrefService.ReadError", error,
 360                             PersistentPrefStore::PREF_READ_ERROR_MAX_ENUM);
 361
 362   if (error != PersistentPrefStore::PREF_READ_ERROR_NONE) {
 363 #if !defined(OS_CHROMEOS)
 364     // Failing to load prefs on startup is a bad thing(TM). See bug 38352 for
 365     // an example problem that this can cause.
 366     // Do some diagnosis and try to avoid losing data.
 367     int message_id = 0;
 368     if (error <= PersistentPrefStore::PREF_READ_ERROR_JSON_TYPE ||
 369         error == PersistentPrefStore::PREF_READ_ERROR_LEVELDB_CORRUPTION) {
 370       message_id = IDS_PREFERENCES_CORRUPT_ERROR;
 371     } else if (error != PersistentPrefStore::PREF_READ_ERROR_NO_FILE) {
 372       message_id = IDS_PREFERENCES_UNREADABLE_ERROR;
 373     }
 374
 375     if (message_id) {
 376       BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
 377                               base::Bind(&ShowProfileErrorDialog,
 378                                          PROFILE_ERROR_PREFERENCES,
 379                                          message_id));
 380     }
 381 #else
 382     // On ChromeOS error screen with message about broken local state
 383     // will be displayed.
 384
 385     // A supplementary error message about broken local state - is included
 386     // in logs and user feedbacks.
 387     if (error != PersistentPrefStore::PREF_READ_ERROR_NONE &&
 388         error != PersistentPrefStore::PREF_READ_ERROR_NO_FILE) {
 389       LOG(ERROR) << "An error happened during prefs loading: " << error;
 390     }
 391 #endif
 392   }
 393 }
 394
 395 scoped_ptr<ProfilePrefStoreManager> CreateProfilePrefStoreManager(
 396     const base::FilePath& profile_path) {
 397   std::string device_id;
 398 #if defined(OS_WIN) && defined(ENABLE_RLZ)
 399   // This is used by
 400   // chrome/browser/extensions/api/music_manager_private/device_id_win.cc
 401   // but that API is private (http://crbug.com/276485) and other platforms are
 402   // not available synchronously.
 403   // As part of improving pref metrics on other platforms we may want to find
 404   // ways to defer preference loading until the device ID can be used.
 405   rlz_lib::GetMachineId(&device_id);
 406 #endif
 407   std::string seed;
 408 #if defined(GOOGLE_CHROME_BUILD)
 409   seed = ResourceBundle::GetSharedInstance().GetRawDataResource(
 410       IDR_PREF_HASH_SEED_BIN).as_string();
 411 #endif
 412   return make_scoped_ptr(new ProfilePrefStoreManager(
 413       profile_path,
 414       GetTrackingConfiguration(),
 415       kTrackedPrefsReportingIDsCount,
 416       seed,
 417       device_id,
 418       g_browser_process->local_state()));
 419 }
 420
 421 void PrepareFactory(
 422     PrefServiceSyncableFactory* factory,
 423     policy::PolicyService* policy_service,
 424     SupervisedUserSettingsService* supervised_user_settings,
 425     scoped_refptr<PersistentPrefStore> user_pref_store,
 426     const scoped_refptr<PrefStore>& extension_prefs,
 427     bool async) {
 428 #if defined(ENABLE_CONFIGURATION_POLICY)
 429   using policy::ConfigurationPolicyPrefStore;
 430   factory->set_managed_prefs(
 431       make_scoped_refptr(new ConfigurationPolicyPrefStore(
 432           policy_service,
 433           g_browser_process->browser_policy_connector()->GetHandlerList(),
 434           policy::POLICY_LEVEL_MANDATORY)));
 435   factory->set_recommended_prefs(
 436       make_scoped_refptr(new ConfigurationPolicyPrefStore(
 437           policy_service,
 438           g_browser_process->browser_policy_connector()->GetHandlerList(),
 439           policy::POLICY_LEVEL_RECOMMENDED)));
 440 #endif  // ENABLE_CONFIGURATION_POLICY
 441
 442 #if defined(ENABLE_SUPERVISED_USERS)
 443   if (supervised_user_settings) {
 444     scoped_refptr<PrefStore> supervised_user_prefs = make_scoped_refptr(
 445         new SupervisedUserPrefStore(supervised_user_settings));
 446     // TODO(bauerb): Temporary CHECK while investigating
 447     // https://crbug.com/425785. Remove when that bug is fixed.
 448     CHECK(async || supervised_user_prefs->IsInitializationComplete());
 449     factory->set_supervised_user_prefs(supervised_user_prefs);
 450   }
 451 #endif
 452
 453   factory->set_async(async);
 454   factory->set_extension_prefs(extension_prefs);
 455   factory->set_command_line_prefs(make_scoped_refptr(
 456       new CommandLinePrefStore(base::CommandLine::ForCurrentProcess())));
 457   factory->set_read_error_callback(base::Bind(&HandleReadError));
 458   factory->set_user_prefs(user_pref_store);
 459 }
 460
 461 }  // namespace
 462
 463 namespace chrome_prefs {
 464
 465 namespace internals {
 466
 467 // Group modifications should be reflected in first_run_browsertest.cc and
 468 // pref_hash_browsertest.cc.
 469 const char kSettingsEnforcementTrialName[] = "SettingsEnforcement";
 470 const char kSettingsEnforcementGroupNoEnforcement[] = "no_enforcement";
 471 const char kSettingsEnforcementGroupEnforceAlways[] = "enforce_always";
 472 const char kSettingsEnforcementGroupEnforceAlwaysWithDSE[] =
 473     "enforce_always_with_dse";
 474 const char kSettingsEnforcementGroupEnforceAlwaysWithExtensionsAndDSE[] =
 475     "enforce_always_with_extensions_and_dse";
 476
 477 }  // namespace internals
 478
 479 scoped_ptr<PrefService> CreateLocalState(
 480     const base::FilePath& pref_filename,
 481     base::SequencedTaskRunner* pref_io_task_runner,
 482     policy::PolicyService* policy_service,
 483     const scoped_refptr<PrefRegistry>& pref_registry,
 484     bool async) {
 485   PrefServiceSyncableFactory factory;
 486   PrepareFactory(
 487       &factory,
 488       policy_service,
 489       NULL,  // supervised_user_settings
 490       new JsonPrefStore(
 491           pref_filename, pref_io_task_runner, scoped_ptr<PrefFilter>()),
 492       NULL,  // extension_prefs
 493       async);
 494   return factory.Create(pref_registry.get());
 495 }
 496
 497 scoped_ptr<PrefServiceSyncable> CreateProfilePrefs(
 498     const base::FilePath& profile_path,
 499     base::SequencedTaskRunner* pref_io_task_runner,
 500     TrackedPreferenceValidationDelegate* validation_delegate,
 501     policy::PolicyService* policy_service,
 502     SupervisedUserSettingsService* supervised_user_settings,
 503     const scoped_refptr<PrefStore>& extension_prefs,
 504     const scoped_refptr<user_prefs::PrefRegistrySyncable>& pref_registry,
 505     bool async) {
 506   TRACE_EVENT0("browser", "chrome_prefs::CreateProfilePrefs");
 507   SCOPED_UMA_HISTOGRAM_TIMER("PrefService.CreateProfilePrefsTime");
 508
 509   // A StartSyncFlare used to kick sync early in case of a reset event. This is
 510   // done since sync may bring back the user's server value post-reset which
 511   // could potentially cause a "settings flash" between the factory default and
 512   // the re-instantiated server value. Starting sync ASAP minimizes the window
 513   // before the server value is re-instantiated (this window can otherwise be
 514   // as long as 10 seconds by default).
 515   const base::Closure start_sync_flare_for_prefs =
 516       base::Bind(sync_start_util::GetFlareForSyncableService(profile_path),
 517                  syncer::PREFERENCES);
 518
 519   PrefServiceSyncableFactory factory;
 520   scoped_refptr<PersistentPrefStore> user_pref_store(
 521       CreateProfilePrefStoreManager(profile_path)
 522           ->CreateProfilePrefStore(pref_io_task_runner,
 523                                    start_sync_flare_for_prefs,
 524                                    validation_delegate));
 525   PrepareFactory(&factory,
 526                  policy_service,
 527                  supervised_user_settings,
 528                  user_pref_store,
 529                  extension_prefs,
 530                  async);
 531   scoped_ptr<PrefServiceSyncable> pref_service =
 532       factory.CreateSyncable(pref_registry.get());
 533
 534   ConfigureDefaultSearchPrefMigrationToDictionaryValue(pref_service.get());
 535
 536   return pref_service.Pass();
 537 }
 538
 539 void SchedulePrefsFilePathVerification(const base::FilePath& profile_path) {
 540 #if defined(OS_WIN)
 541   // Only do prefs file verification on Windows.
 542   const int kVerifyPrefsFileDelaySeconds = 60;
 543   BrowserThread::GetBlockingPool()->PostDelayedTask(
 544       FROM_HERE,
 545       base::Bind(&VerifyPreferencesFile,
 546                  ProfilePrefStoreManager::GetPrefFilePathFromProfilePath(
 547                      profile_path)),
 548       base::TimeDelta::FromSeconds(kVerifyPrefsFileDelaySeconds));
 549 #endif
 550 }
 551
 552 void DisableDomainCheckForTesting() {
 553 #if defined(OS_WIN)
 554   g_disable_domain_check_for_testing = true;
 555 #endif  // OS_WIN
 556 }
 557
 558 bool InitializePrefsFromMasterPrefs(
 559     const base::FilePath& profile_path,
 560     const base::DictionaryValue& master_prefs) {
 561   return CreateProfilePrefStoreManager(profile_path)
 562       ->InitializePrefsFromMasterPrefs(master_prefs);
 563 }
 564
 565 base::Time GetResetTime(Profile* profile) {
 566   return ProfilePrefStoreManager::GetResetTime(profile->GetPrefs());
 567 }
 568
 569 void ClearResetTime(Profile* profile) {
 570   ProfilePrefStoreManager::ClearResetTime(profile->GetPrefs());
 571 }
 572
 573 void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
 574   ProfilePrefStoreManager::RegisterProfilePrefs(registry);
 575 }
 576
 577 void RegisterPrefs(PrefRegistrySimple* registry) {
 578   ProfilePrefStoreManager::RegisterPrefs(registry);
 579 }
 580
 581 }  // namespace chrome_prefs