[SyncFS] Add idle callback to SyncFileSystemService for testing

chrome/browser/sync_file_system/sync_process_runner.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_SYNC_PROCESS_RUNNER_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_SYNC_PROCESS_RUNNER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 60 matching lines @@
   virtual ~SyncProcessRunner();
 
   // Subclass must implement this.
   virtual void StartSync(const SyncStatusCallback& callback) = 0;
 
   // Schedules a new sync.
   void Schedule();
 
   int64 pending_changes() const { return pending_changes_; }
 
+  // Returns the current service state.  Default implementation returns
+  // sync_service()->GetSyncServiceState().
+  virtual SyncServiceState GetServiceState();
+
  protected:
   void OnChangesUpdated(int64 pending_changes);
   SyncFileSystemService* GetSyncService();
 
-  // Returns the current service state.  Default implementation returns
-  // sync_service()->GetSyncServiceState().
-  virtual SyncServiceState GetServiceState();
-
  private:
   void Finished(const base::TimeTicks& start_time, SyncStatusCode status);
   void Run();
   void ScheduleInternal(int64 delay);
 
   // Throttles new sync for |base_delay| milliseconds for an error case.
   // If new sync is already throttled, back off the duration.
   void ThrottleSync(int64 base_delay);
 
   // Clears old throttling setting that is already over.
   void ResetOldThrottling();
   void ResetThrottling();
 
+  void CheckIfIdle();
+
   std::string name_;
   Client* client_;
   size_t max_parallel_task_;
   size_t running_tasks_;
   scoped_ptr<TimerHelper> timer_helper_;
   base::TimeTicks last_run_;
   base::TimeTicks last_scheduled_;
   SyncServiceState service_state_;
 
   base::TimeTicks throttle_from_;
   base::TimeTicks throttle_until_;
 
   int64 pending_changes_;
   base::WeakPtrFactory<SyncProcessRunner> factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncProcessRunner);
 };
 
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_SYNC_PROCESS_RUNNER_H_