[Sync] Introduce GmsCoreSyncListener.

components/browser_sync/browser/profile_sync_service.h

 // Copyright (c) 2012 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 COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_SERVICE_H_
 #define COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_SERVICE_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 548 matching lines @@
   // Returns the current mode the backend is in.
   BackendMode backend_mode() const;
 
   base::Time GetDeviceBackupTimeForTesting() const;
 
   // This triggers a Directory::SaveChanges() call on the sync thread.
   // It should be used to persist data to disk when the process might be
   // killed in the near future.
   void FlushDirectory() const;
 
+  // Returns a serialized NigoriKey proto generated from the bootstrap token in
+  // SyncPrefs. Will return the empty string if no bootstrap token exists.
+  std::string GetCustomPassphraseKey() const;
+
   // Needed to test whether the directory is deleted properly.
   base::FilePath GetDirectoryPathForTest() const;
 
   // Sometimes we need to wait for tasks on the sync thread in tests.
   base::MessageLoop* GetSyncLoopForTest() const;
 
   // Triggers sync cycle with request to update specified |types|.
   void RefreshTypesForTest(syncer::ModelTypeSet types);
 
  protected:
@@ skipping 428 matching lines @@
   base::WeakPtrFactory<ProfileSyncService> startup_controller_weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(
     const syncer::SyncProtocolError& error);
 
 
 #endif  // COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_SERVICE_H_