[SyncFS] Post tasks between SyncEngine and SyncWorker

chrome/browser/sync_file_system/drive_backend/sync_engine_context.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_CONTEXT_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_ENGINE_CONTEXT_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 14 matching lines @@
 
 namespace drive_backend {
 
 class MetadataDatabase;
 
 class SyncEngineContext {
  public:
   SyncEngineContext(
       drive::DriveServiceInterface* drive_service,
       drive::DriveUploaderInterface* drive_uploader,
-      base::SequencedTaskRunner* task_runner);
+      base::SequencedTaskRunner* ui_task_runner,
+      base::SequencedTaskRunner* file_task_runner);
   ~SyncEngineContext();
 
   drive::DriveServiceInterface* GetDriveService();
   drive::DriveUploaderInterface* GetDriveUploader();
   MetadataDatabase* GetMetadataDatabase();
   RemoteChangeProcessor* GetRemoteChangeProcessor();
-  base::SequencedTaskRunner* GetBlockingTaskRunner();
+  base::SequencedTaskRunner* GetUiTaskRunner();
+  base::SequencedTaskRunner* GetFileTaskRunner();
 
   void SetMetadataDatabase(scoped_ptr<MetadataDatabase> metadata_database);
   void SetRemoteChangeProcessor(RemoteChangeProcessor* remote_change_processor);
 
   scoped_ptr<MetadataDatabase> PassMetadataDatabase();
 
  private:
   drive::DriveServiceInterface* drive_service_;
   drive::DriveUploaderInterface* drive_uploader_;
   RemoteChangeProcessor* remote_change_processor_;
 
   scoped_ptr<MetadataDatabase> metadata_database_;
-  scoped_refptr<base::SequencedTaskRunner> task_runner_;
+  scoped_refptr<base::SequencedTaskRunner> ui_task_runner_;
+  scoped_refptr<base::SequencedTaskRunner> file_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncEngineContext);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_ENGINE_CONTEXT_H_