[SyncFS] Run V2 backend tasks as SyncTask

chrome/browser/sync_file_system/drive_backend/sync_task_token.h

 // Copyright 2014 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_TASK_TOKEN_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_TASK_TOKEN_H_
 
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 40 matching lines @@
   void set_blocking_factor(scoped_ptr<BlockingFactor> blocking_factor);
   const BlockingFactor* blocking_factor() const;
   void clear_blocking_factor();
 
   int64 token_id() const { return token_id_; }
 
   void InitializeTaskLog(const std::string& task_description);
   void FinalizeTaskLog(const std::string& result_description);
   void RecordLog(const std::string& message);
 
+  bool has_task_log() const { return task_log_; }
   void SetTaskLog(scoped_ptr<TaskLogger::TaskLog> task_log);
   scoped_ptr<TaskLogger::TaskLog> PassTaskLog();
 
  private:
   SyncTaskToken(const base::WeakPtr<SyncTaskManager>& manager,
                 int64 token_id,
                 scoped_ptr<BlockingFactor> blocking_factor,
                 const SyncStatusCallback& callback);
 
   base::WeakPtr<SyncTaskManager> manager_;
   tracked_objects::Location location_;
   int64 token_id_;
   SyncStatusCallback callback_;
 
   scoped_ptr<TaskLogger::TaskLog> task_log_;
   scoped_ptr<BlockingFactor> blocking_factor_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncTaskToken);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_TASK_TOKEN_H_