[SyncFS] Create SyncWorkerInterface

chrome/browser/sync_file_system/drive_backend/sync_engine.h

 // Copyright 2013 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_FILE_SYSTEM_DRIVE_BACKEND_SYNC_ENGINE_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_ENGINE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 31 matching lines @@
 class RemoteChangeProcessor;
 
 namespace drive_backend {
 
 class DriveServiceWrapper;
 class DriveUploaderWrapper;
 class MetadataDatabase;
 class RemoteChangeProcessorOnWorker;
 class RemoteChangeProcessorWrapper;
 class SyncTaskManager;
-class SyncWorker;
+class SyncWorkerInterface;
 
 class SyncEngine : public RemoteFileSyncService,
                    public LocalChangeProcessor,
                    public drive::DriveNotificationObserver,
                    public drive::DriveServiceObserver,
                    public net::NetworkChangeNotifier::NetworkChangeObserver {
  public:
   typedef Observer SyncServiceObserver;
 
   static scoped_ptr<SyncEngine> CreateForBrowserContext(
@@ skipping 104 matching lines @@
   // I.e. the owner should declare the dependency explicitly by calling
   // KeyedService::DependsOn().
   drive::DriveNotificationManager* notification_manager_;
   ExtensionServiceInterface* extension_service_;
   SigninManagerBase* signin_manager_;
 
   ObserverList<SyncServiceObserver> service_observers_;
   ObserverList<FileStatusObserver> file_status_observers_;
 
   scoped_ptr<WorkerObserver> worker_observer_;
-  scoped_ptr<SyncWorker> sync_worker_;
+  scoped_ptr<SyncWorkerInterface> sync_worker_;
   scoped_refptr<base::SequencedTaskRunner> worker_task_runner_;
 
   CallbackTracker callback_tracker_;
 
   base::WeakPtrFactory<SyncEngine> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(SyncEngine);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_ENGINE_H_