[Sync] Tidy up SyncBackendHost interface.

chrome/browser/sync/profile_sync_service.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #define CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #pragma once
 
 #include <string>
 
@@ skipping 167 matching lines @@
   virtual void SetSyncSetupCompleted();
 
   // SyncFrontend implementation.
   virtual void OnBackendInitialized();
   virtual void OnSyncCycleCompleted();
   virtual void OnAuthError();
   virtual void OnStopSyncingPermanently();
   virtual void OnClearServerDataFailed();
   virtual void OnClearServerDataTimeout();
   virtual void OnClearServerDataSucceeded();
+  virtual void OnPassphraseRequired(bool for_decryption);
+  virtual void OnPassphraseAccepted();
 
   // Called when a user enters credentials through UI.
   virtual void OnUserSubmittedAuth(const std::string& username,
                                    const std::string& password,
                                    const std::string& captcha,
                                    const std::string& access_code);
 
   // Update the last auth error and notify observers of error state.
   void UpdateAuthErrorState(const GoogleServiceAuthError& error);
 
@@ skipping 260 matching lines @@
   // If |delete_sync_data_folder| is true, then this method will delete all
   // previous "Sync Data" folders. (useful if the folder is partial/corrupt).
   void InitializeBackend(bool delete_sync_data_folder);
 
   // Initializes the various settings from the command line.
   void InitSettings();
 
   // Sets the last synced time to the current time.
   void UpdateLastSyncedTime();
 
+  void NotifyObservers();
+
   static const char* GetPrefNameForDataType(syncable::ModelType data_type);
 
   // Time at which we begin an attempt a GAIA authorization.
   base::TimeTicks auth_start_time_;
 
   // Time at which error UI is presented for the new tab page.
   base::TimeTicks auth_error_time_;
 
   // Factory used to create various dependent objects.
   ProfileSyncFactory* factory_;
@@ skipping 91 matching lines @@
   // and is necessary because the nudge sync framework can drop nudges for
   // a wide variety of sync-related conditions (throttling, connections issues,
   // syncer paused, etc.).  It can only be removed correctly when the framework
   // is reworked to allow one-shot commands like clearing server data.
   base::OneShotTimer<ProfileSyncService> clear_server_data_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_