components/sync/base/features.h - chromium/src - Git at Google

 // Copyright 2022 The Chromium Authors
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #ifndef COMPONENTS_SYNC_BASE_FEATURES_H_
 #define COMPONENTS_SYNC_BASE_FEATURES_H_

 #include "base/feature_list.h"
 #include "base/metrics/field_trial_params.h"

 namespace syncer {

 // Customizes the delay of a deferred sync startup.
 // Note from 04/2024: The first attempt to roll this out on 05/2023 ran into
 // performance regressions (go/deferred-startup-experiment-metrics, sorry
 // Googlers only). It might still be possible to launch by investigating and
 // fixing the performance issues. crbug.com/40872516 tracks that.
 BASE_DECLARE_FEATURE(kDeferredSyncStartupCustomDelay);
 inline constexpr base::FeatureParam<int>
     kDeferredSyncStartupCustomDelayInSeconds{
         &kDeferredSyncStartupCustomDelay,
         "DeferredSyncStartupCustomDelayInSeconds", 1};

 // Enables syncing of settings from the user's account.
 BASE_DECLARE_FEATURE(kSyncAccountSettings);

 // Enables syncing of valuables from the user's account.
 #if BUILDFLAG(IS_IOS)
 BASE_DECLARE_FEATURE(kSyncAutofillValuable);
 #endif

 // Enables syncing of usage metadata from Google Wallet passes.
 BASE_DECLARE_FEATURE(kSyncAutofillValuableMetadata);

 // Enables syncing account-local metadata for shared tab groups.
 BASE_DECLARE_FEATURE(kSyncSharedTabGroupAccountData);

 // Enables syncing comments for shared contexts.
 BASE_DECLARE_FEATURE(kSyncSharedComment);

 // Enables syncing of AI threads across devices.
 BASE_DECLARE_FEATURE(kSyncAIThread);

 // Enables syncing of contextual tasks.
 BASE_DECLARE_FEATURE(kSyncContextualTask);

 // Enables syncing of Gemini threads across devices.
 BASE_DECLARE_FEATURE(kSyncGeminiThread);

 // Enables syncing of Encrypted Tab Context Containers across devices.
 BASE_DECLARE_FEATURE(kSyncEncryptedTabContextContainer);

 // Enables syncing of themes across iOS devices.
 BASE_DECLARE_FEATURE(kSyncThemesIos);

 // Enables syncing of New Tab Page customization themes on Android.
 BASE_DECLARE_FEATURE(kNewTabPageCustomizationThemeSync);

 // Enables syncing of usage metadata for loyalty cards.
 BASE_DECLARE_FEATURE(kSyncLoyaltyCardMetadata);

 #if !BUILDFLAG(IS_CHROMEOS)
 // Flag that controls Uno fast-follow features which are:
 // On Android:
 // - Batch upload of left-behind bookmarks from the bookmark manager
 // - Turn on bookmarks and reading list when signing in from bookmark manager
 // - Confirmation dialog when turning off “Allow Chrome sign-in”
 // - Promo for signed-in users with bookmarks toggle off
 // On desktop:
 // Adding history sync opt-in entry points, and other follow-ups to
 // `kReplaceSyncPromosWithSignInPromos`.
 BASE_DECLARE_FEATURE(kUnoPhase2FollowUp);
 #endif  // !BUILDFLAG(IS_CHROMEOS)

 // Do not use this flag directly. Use
 // IsContactInfoDataTypeForCustomPassphraseUsersEnabled() instead.
 BASE_DECLARE_FEATURE(kSyncEnableContactInfoDataTypeForCustomPassphraseUsers);

 // If enabled, the Contact Info data type will be enabled for users with custom
 // passphrase.
 bool IsContactInfoDataTypeForCustomPassphraseUsersEnabled();

 BASE_DECLARE_FEATURE(kSyncEnableContactInfoDataTypeForDasherUsers);

 // If enabled, keeps local and account search engines separate.
 BASE_DECLARE_FEATURE(kSeparateLocalAndAccountSearchEngines);

 // Feature flag to replace all sync-related UI with sign-in ones.
 // Do not use this flag directly in production code. Use
 // `syncer::IsReplaceSyncPromosWithSignInPromosEnabled()` instead.
 BASE_DECLARE_FEATURE(kReplaceSyncPromosWithSignInPromos);

 // Feature flag to replace all sync-related UI with sign-in ones. This
 // feature has the same behavior as kReplaceSyncPromosWithSignInPromos, but only
 // enables extensions and bookmarks on new sign-ins.
 BASE_DECLARE_FEATURE(kReplaceSyncPromosWithSigninPromosNewSignin);

 // Returns true if the replace sync promos with sign-in promos feature is
 // enabled. The launch may be controlled by multiple `base::Feature` flags,
 // prefer using this function over checking the feature flags directly.
 bool IsReplaceSyncPromosWithSignInPromosEnabled();

 // Enables syncing of flight reservations coming from Google Wallet.
 BASE_DECLARE_FEATURE(kSyncWalletFlightReservations);

 // Enables syncing of vehicle registrations coming from Google Wallet.
 BASE_DECLARE_FEATURE(kSyncWalletVehicleRegistrations);

 // If enabled, the spellcheck custom dictionary will keep the account dictionary
 // separate from the local dictionary.
 // TODO(crbug.com/443954137): This feature doesn't yet do anything. Implement
 // the local and account data separation behind this feature flag.
 BASE_DECLARE_FEATURE(kSpellcheckSeparateLocalAndAccountDictionaries);

 // Feature flag used for enabling sync (transport mode) for signed-in users that
 // haven't turned on full sync.
 #if !BUILDFLAG(IS_ANDROID) && !BUILDFLAG(IS_IOS)
 BASE_DECLARE_FEATURE(kReadingListEnableSyncTransportModeUponSignIn);
 // Returns whether reading list storage related UI can be enabled, by testing
 // `kReadingListEnableSyncTransportModeUponSignIn`.
 bool IsReadingListAccountStorageEnabled();
 #else
 constexpr bool IsReadingListAccountStorageEnabled() {
   return true;
 }
 #endif  // !BUILDFLAG(IS_ANDROID) && !BUILDFLAG(IS_IOS)

 // If enabled, sync-the-transport will auto-start (avoid deferring startup) if
 // sync metadata isn't available (i.e. initial sync never completed).
 BASE_DECLARE_FEATURE(kSyncAlwaysForceImmediateStartIfTransportDataMissing);

 // If enabled, support displaying and uploading individual Reading List items in
 // the Batch Upload UI.
 //
 // Batch Upload of all items is supported regardless of this feature flag.
 //
 // On Windows/Mac/Linux: this flag only affects behavior if the
 // `syncer::kReadingListEnableSyncTransportModeUponSignIn` feature is also
 // enabled.
 //
 // On Android: this flag does not affect user-visiable behavior, but does enable
 // new code paths.
 BASE_DECLARE_FEATURE(kSyncReadingListBatchUploadSelectedItems);

 // If enabled, distinguishes between local and account themes.
 BASE_DECLARE_FEATURE(kSeparateLocalAndAccountThemes);

 // If enabled, offers batch upload of local themes upon sign in.
 BASE_DECLARE_FEATURE(kThemesBatchUpload);

 // If enabled, the local change nudge delays for single-client users are
 // increased by some factor, specified via the FeatureParam below.
 BASE_DECLARE_FEATURE(kSyncIncreaseNudgeDelayForSingleClient);

 inline constexpr base::FeatureParam<double>
     kSyncIncreaseNudgeDelayForSingleClientFactor{
         &kSyncIncreaseNudgeDelayForSingleClient,
         "SyncIncreaseNudgeDelayForSingleClientFactor", 2.0};

 #if BUILDFLAG(IS_ANDROID)
 // If enabled, WebAPK data will be synced for Backup&Restore purposes.
 BASE_DECLARE_FEATURE(kWebApkBackupAndRestoreBackend);
 #endif  // BUILDFLAG(IS_ANDROID)

 #if BUILDFLAG(IS_ANDROID)
 // Flag to test different alternatives for the passwords sync error message
 // content.
 BASE_DECLARE_FEATURE(kSyncEnablePasswordsSyncErrorMessageAlternative);
 inline constexpr base::FeatureParam<int>
     kSyncEnablePasswordsSyncErrorMessageAlternativeVersion{
         &kSyncEnablePasswordsSyncErrorMessageAlternative, "version", 3};

 // If enabled, the error message to unlock passwords is shown for longer.
 BASE_DECLARE_FEATURE(kSyncTrustedVaultErrorMessageDuration);
 #endif  // BUILDFLAG(IS_ANDROID)

 #if BUILDFLAG(IS_IOS)
 // Enables a message improvements to the existing trusted vault error infobar
 // (informing users that fixing the error will help them to start syncing their
 // passwords).
 BASE_DECLARE_FEATURE(kSyncTrustedVaultInfobarMessageImprovements);
 #endif  // BUILDFLAG(IS_IOS)

 // If enabled, the preferences sync service will use the selected types to
 // determine whether the pref values should be set in the account storage.
 BASE_DECLARE_FEATURE(kSyncPreferencesUseSelectedTypes);

 BASE_DECLARE_FEATURE(kSyncDetermineAccountManagedStatus);
 BASE_DECLARE_FEATURE_PARAM(base::TimeDelta,
                            kSyncDetermineAccountManagedStatusTimeout);

 // If enabled, the new sync dashboard URL will be opened when the user clicks
 // on the "Review your synced data" (or equivalent) entrypoint in settings.
 BASE_DECLARE_FEATURE(kSyncEnableNewSyncDashboardUrl);

 // If enabled, Sync will fetch device statistics for all accounts on the device,
 // and record summary metrics about them.
 BASE_DECLARE_FEATURE(kSyncRecordDeviceStatisticsMetrics);
 // Delay before downloading device statistics and recording related metrics. The
 // exact number is somewhat arbitrary, chosen to ensure that refresh tokens are
 // loaded, the local cache GUID is up to date, and to avoid interfering with
 // general (sync or browser) startup.
 BASE_DECLARE_FEATURE_PARAM(base::TimeDelta,
                            kSyncRecordDeviceStatisticsMetricsDelay);
 // Controls how often device statistics are collected and recorded in metrics,
 // as the minimum number of days between recordings.
 BASE_DECLARE_FEATURE_PARAM(int, kSyncRecordDeviceStatisticsMetricsPeriodDays);

 // If enabled, DeviceInfoSyncBridge uses WallClockTimer for pulse updates,
 // which is more resilient to device suspension.
 BASE_DECLARE_FEATURE(kSyncDeviceInfoUseWallClockTimer);

 // If enabled, validate the access token before sending the request to the
 // server.
 BASE_DECLARE_FEATURE(kSyncValidateAccessToken);

 // If enabled, Sync invalidations will bypass the scheduler on Android.
 BASE_DECLARE_FEATURE(kSyncInvalidationsBypassScheduler);

 #if BUILDFLAG(IS_ANDROID)
 // If enabled, search engines and site search will be synced on Android LFF.
 BASE_DECLARE_FEATURE(kSyncSearchEnginesAndroidLFF);

 // If enabled, ignores the value set in sessions_invalidations_enabled_ and
 // always registers for sessions invalidations.
 BASE_DECLARE_FEATURE(kAlwaysRegisterSessionsInvalidationsAndroid);

 // If enabled, the android.os.Build.FINGERPRINT prefix is uploaded in
 // DeviceInfo.
 // TODO(crbug.com/522788942): Consolidate this with
 // kSyncUseServerDeterminedDeviceName.
 BASE_DECLARE_FEATURE(kSyncUploadAndroidBuildFingerprintPrefix);
 #endif  // BUILDFLAG(IS_ANDROID)

 #if BUILDFLAG(IS_CHROMEOS)
 // Feature flag for ChromeOS only to estimate new sign-in users population.
 BASE_DECLARE_FEATURE(kEstimateNewSignInUsersWithFinchAvailablePopulation);
 #endif  // BUILDFLAG(IS_CHROMEOS)

 // If enabled, computes the web sign-in status based on account in cookies
 // values even if they are stale. This ensures that we log the last known cookie
 // sign-in status for short-lived sessions instead of the default OFF value.
 BASE_DECLARE_FEATURE(kSyncFixWebSigninSessionDurationForShortLivedSessions);

 // If enabled, simplifies the device naming architecture by using the
 // most user friendly name that can be computed for a device (the so-called
 // "preferred name" in legacy path) as a single source of truth, bypassing the
 // legacy deduplication and name-based local device filtering. This affects Send
 // Tab to Self and Sharing features.
 BASE_DECLARE_FEATURE(kSyncSimplifyDeviceNaming);

 // If enabled, uses the server-determined model name (marketing name) as the
 // preferred name (and fallback name) if available. This provides a more
 // recognizable name for the user.
 BASE_DECLARE_FEATURE(kSyncUseServerDeterminedDeviceName);

 // If enabled, copies selected types preferences from global profile preferences
 // to account-keyed preferences upon a DISABLE_SYNC_ON_CLIENT protocol error
 // before entering transport mode.
 BASE_DECLARE_FEATURE(kSyncCopyPreferencesToTransportModeOnServerForcedDisable);

 }  // namespace syncer

 #endif  // COMPONENTS_SYNC_BASE_FEATURES_H_
	// Copyright 2022 The Chromium Authors
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#ifndef COMPONENTS_SYNC_BASE_FEATURES_H_
	#define COMPONENTS_SYNC_BASE_FEATURES_H_

	#include "base/feature_list.h"
	#include "base/metrics/field_trial_params.h"

	namespace syncer {

	// Customizes the delay of a deferred sync startup.
	// Note from 04/2024: The first attempt to roll this out on 05/2023 ran into
	// performance regressions (go/deferred-startup-experiment-metrics, sorry
	// Googlers only). It might still be possible to launch by investigating and
	// fixing the performance issues. crbug.com/40872516 tracks that.
	BASE_DECLARE_FEATURE(kDeferredSyncStartupCustomDelay);
	inline constexpr base::FeatureParam<int>
	kDeferredSyncStartupCustomDelayInSeconds{
	&kDeferredSyncStartupCustomDelay,
	"DeferredSyncStartupCustomDelayInSeconds", 1};

	// Enables syncing of settings from the user's account.
	BASE_DECLARE_FEATURE(kSyncAccountSettings);

	// Enables syncing of valuables from the user's account.
	#if BUILDFLAG(IS_IOS)
	BASE_DECLARE_FEATURE(kSyncAutofillValuable);
	#endif

	// Enables syncing of usage metadata from Google Wallet passes.
	BASE_DECLARE_FEATURE(kSyncAutofillValuableMetadata);

	// Enables syncing account-local metadata for shared tab groups.
	BASE_DECLARE_FEATURE(kSyncSharedTabGroupAccountData);

	// Enables syncing comments for shared contexts.
	BASE_DECLARE_FEATURE(kSyncSharedComment);

	// Enables syncing of AI threads across devices.
	BASE_DECLARE_FEATURE(kSyncAIThread);

	// Enables syncing of contextual tasks.
	BASE_DECLARE_FEATURE(kSyncContextualTask);

	// Enables syncing of Gemini threads across devices.
	BASE_DECLARE_FEATURE(kSyncGeminiThread);

	// Enables syncing of Encrypted Tab Context Containers across devices.
	BASE_DECLARE_FEATURE(kSyncEncryptedTabContextContainer);

	// Enables syncing of themes across iOS devices.
	BASE_DECLARE_FEATURE(kSyncThemesIos);

	// Enables syncing of New Tab Page customization themes on Android.
	BASE_DECLARE_FEATURE(kNewTabPageCustomizationThemeSync);

	// Enables syncing of usage metadata for loyalty cards.
	BASE_DECLARE_FEATURE(kSyncLoyaltyCardMetadata);

	#if !BUILDFLAG(IS_CHROMEOS)
	// Flag that controls Uno fast-follow features which are:
	// On Android:
	// - Batch upload of left-behind bookmarks from the bookmark manager
	// - Turn on bookmarks and reading list when signing in from bookmark manager
	// - Confirmation dialog when turning off “Allow Chrome sign-in”
	// - Promo for signed-in users with bookmarks toggle off
	// On desktop:
	// Adding history sync opt-in entry points, and other follow-ups to
	// `kReplaceSyncPromosWithSignInPromos`.
	BASE_DECLARE_FEATURE(kUnoPhase2FollowUp);
	#endif // !BUILDFLAG(IS_CHROMEOS)

	// Do not use this flag directly. Use
	// IsContactInfoDataTypeForCustomPassphraseUsersEnabled() instead.
	BASE_DECLARE_FEATURE(kSyncEnableContactInfoDataTypeForCustomPassphraseUsers);

	// If enabled, the Contact Info data type will be enabled for users with custom
	// passphrase.
	bool IsContactInfoDataTypeForCustomPassphraseUsersEnabled();

	BASE_DECLARE_FEATURE(kSyncEnableContactInfoDataTypeForDasherUsers);

	// If enabled, keeps local and account search engines separate.
	BASE_DECLARE_FEATURE(kSeparateLocalAndAccountSearchEngines);

	// Feature flag to replace all sync-related UI with sign-in ones.
	// Do not use this flag directly in production code. Use
	// `syncer::IsReplaceSyncPromosWithSignInPromosEnabled()` instead.
	BASE_DECLARE_FEATURE(kReplaceSyncPromosWithSignInPromos);

	// Feature flag to replace all sync-related UI with sign-in ones. This
	// feature has the same behavior as kReplaceSyncPromosWithSignInPromos, but only
	// enables extensions and bookmarks on new sign-ins.
	BASE_DECLARE_FEATURE(kReplaceSyncPromosWithSigninPromosNewSignin);

	// Returns true if the replace sync promos with sign-in promos feature is
	// enabled. The launch may be controlled by multiple `base::Feature` flags,
	// prefer using this function over checking the feature flags directly.
	bool IsReplaceSyncPromosWithSignInPromosEnabled();

	// Enables syncing of flight reservations coming from Google Wallet.
	BASE_DECLARE_FEATURE(kSyncWalletFlightReservations);

	// Enables syncing of vehicle registrations coming from Google Wallet.
	BASE_DECLARE_FEATURE(kSyncWalletVehicleRegistrations);

	// If enabled, the spellcheck custom dictionary will keep the account dictionary
	// separate from the local dictionary.
	// TODO(crbug.com/443954137): This feature doesn't yet do anything. Implement
	// the local and account data separation behind this feature flag.
	BASE_DECLARE_FEATURE(kSpellcheckSeparateLocalAndAccountDictionaries);

	// Feature flag used for enabling sync (transport mode) for signed-in users that
	// haven't turned on full sync.
	#if !BUILDFLAG(IS_ANDROID) && !BUILDFLAG(IS_IOS)
	BASE_DECLARE_FEATURE(kReadingListEnableSyncTransportModeUponSignIn);
	// Returns whether reading list storage related UI can be enabled, by testing
	// `kReadingListEnableSyncTransportModeUponSignIn`.
	bool IsReadingListAccountStorageEnabled();
	#else
	constexpr bool IsReadingListAccountStorageEnabled() {
	return true;
	}
	#endif // !BUILDFLAG(IS_ANDROID) && !BUILDFLAG(IS_IOS)

	// If enabled, sync-the-transport will auto-start (avoid deferring startup) if
	// sync metadata isn't available (i.e. initial sync never completed).
	BASE_DECLARE_FEATURE(kSyncAlwaysForceImmediateStartIfTransportDataMissing);

	// If enabled, support displaying and uploading individual Reading List items in
	// the Batch Upload UI.
	//
	// Batch Upload of all items is supported regardless of this feature flag.
	//
	// On Windows/Mac/Linux: this flag only affects behavior if the
	// `syncer::kReadingListEnableSyncTransportModeUponSignIn` feature is also
	// enabled.
	//
	// On Android: this flag does not affect user-visiable behavior, but does enable
	// new code paths.
	BASE_DECLARE_FEATURE(kSyncReadingListBatchUploadSelectedItems);

	// If enabled, distinguishes between local and account themes.
	BASE_DECLARE_FEATURE(kSeparateLocalAndAccountThemes);

	// If enabled, offers batch upload of local themes upon sign in.
	BASE_DECLARE_FEATURE(kThemesBatchUpload);

	// If enabled, the local change nudge delays for single-client users are
	// increased by some factor, specified via the FeatureParam below.
	BASE_DECLARE_FEATURE(kSyncIncreaseNudgeDelayForSingleClient);

	inline constexpr base::FeatureParam<double>
	kSyncIncreaseNudgeDelayForSingleClientFactor{
	&kSyncIncreaseNudgeDelayForSingleClient,
	"SyncIncreaseNudgeDelayForSingleClientFactor", 2.0};

	#if BUILDFLAG(IS_ANDROID)
	// If enabled, WebAPK data will be synced for Backup&Restore purposes.
	BASE_DECLARE_FEATURE(kWebApkBackupAndRestoreBackend);
	#endif // BUILDFLAG(IS_ANDROID)

	#if BUILDFLAG(IS_ANDROID)
	// Flag to test different alternatives for the passwords sync error message
	// content.
	BASE_DECLARE_FEATURE(kSyncEnablePasswordsSyncErrorMessageAlternative);
	inline constexpr base::FeatureParam<int>
	kSyncEnablePasswordsSyncErrorMessageAlternativeVersion{
	&kSyncEnablePasswordsSyncErrorMessageAlternative, "version", 3};

	// If enabled, the error message to unlock passwords is shown for longer.
	BASE_DECLARE_FEATURE(kSyncTrustedVaultErrorMessageDuration);
	#endif // BUILDFLAG(IS_ANDROID)

	#if BUILDFLAG(IS_IOS)
	// Enables a message improvements to the existing trusted vault error infobar
	// (informing users that fixing the error will help them to start syncing their
	// passwords).
	BASE_DECLARE_FEATURE(kSyncTrustedVaultInfobarMessageImprovements);
	#endif // BUILDFLAG(IS_IOS)

	// If enabled, the preferences sync service will use the selected types to
	// determine whether the pref values should be set in the account storage.
	BASE_DECLARE_FEATURE(kSyncPreferencesUseSelectedTypes);

	BASE_DECLARE_FEATURE(kSyncDetermineAccountManagedStatus);
	BASE_DECLARE_FEATURE_PARAM(base::TimeDelta,
	kSyncDetermineAccountManagedStatusTimeout);

	// If enabled, the new sync dashboard URL will be opened when the user clicks
	// on the "Review your synced data" (or equivalent) entrypoint in settings.
	BASE_DECLARE_FEATURE(kSyncEnableNewSyncDashboardUrl);

	// If enabled, Sync will fetch device statistics for all accounts on the device,
	// and record summary metrics about them.
	BASE_DECLARE_FEATURE(kSyncRecordDeviceStatisticsMetrics);
	// Delay before downloading device statistics and recording related metrics. The
	// exact number is somewhat arbitrary, chosen to ensure that refresh tokens are
	// loaded, the local cache GUID is up to date, and to avoid interfering with
	// general (sync or browser) startup.
	BASE_DECLARE_FEATURE_PARAM(base::TimeDelta,
	kSyncRecordDeviceStatisticsMetricsDelay);
	// Controls how often device statistics are collected and recorded in metrics,
	// as the minimum number of days between recordings.
	BASE_DECLARE_FEATURE_PARAM(int, kSyncRecordDeviceStatisticsMetricsPeriodDays);

	// If enabled, DeviceInfoSyncBridge uses WallClockTimer for pulse updates,
	// which is more resilient to device suspension.
	BASE_DECLARE_FEATURE(kSyncDeviceInfoUseWallClockTimer);

	// If enabled, validate the access token before sending the request to the
	// server.
	BASE_DECLARE_FEATURE(kSyncValidateAccessToken);

	// If enabled, Sync invalidations will bypass the scheduler on Android.
	BASE_DECLARE_FEATURE(kSyncInvalidationsBypassScheduler);

	#if BUILDFLAG(IS_ANDROID)
	// If enabled, search engines and site search will be synced on Android LFF.
	BASE_DECLARE_FEATURE(kSyncSearchEnginesAndroidLFF);

	// If enabled, ignores the value set in sessions_invalidations_enabled_ and
	// always registers for sessions invalidations.
	BASE_DECLARE_FEATURE(kAlwaysRegisterSessionsInvalidationsAndroid);

	// If enabled, the android.os.Build.FINGERPRINT prefix is uploaded in
	// DeviceInfo.
	// TODO(crbug.com/522788942): Consolidate this with
	// kSyncUseServerDeterminedDeviceName.
	BASE_DECLARE_FEATURE(kSyncUploadAndroidBuildFingerprintPrefix);
	#endif // BUILDFLAG(IS_ANDROID)

	#if BUILDFLAG(IS_CHROMEOS)
	// Feature flag for ChromeOS only to estimate new sign-in users population.
	BASE_DECLARE_FEATURE(kEstimateNewSignInUsersWithFinchAvailablePopulation);
	#endif // BUILDFLAG(IS_CHROMEOS)

	// If enabled, computes the web sign-in status based on account in cookies
	// values even if they are stale. This ensures that we log the last known cookie
	// sign-in status for short-lived sessions instead of the default OFF value.
	BASE_DECLARE_FEATURE(kSyncFixWebSigninSessionDurationForShortLivedSessions);

	// If enabled, simplifies the device naming architecture by using the
	// most user friendly name that can be computed for a device (the so-called
	// "preferred name" in legacy path) as a single source of truth, bypassing the
	// legacy deduplication and name-based local device filtering. This affects Send
	// Tab to Self and Sharing features.
	BASE_DECLARE_FEATURE(kSyncSimplifyDeviceNaming);

	// If enabled, uses the server-determined model name (marketing name) as the
	// preferred name (and fallback name) if available. This provides a more
	// recognizable name for the user.
	BASE_DECLARE_FEATURE(kSyncUseServerDeterminedDeviceName);

	// If enabled, copies selected types preferences from global profile preferences
	// to account-keyed preferences upon a DISABLE_SYNC_ON_CLIENT protocol error
	// before entering transport mode.
	BASE_DECLARE_FEATURE(kSyncCopyPreferencesToTransportModeOnServerForcedDisable);

	} // namespace syncer

	#endif // COMPONENTS_SYNC_BASE_FEATURES_H_