[SyncFS] Make base::TimeTicks::Now() dependency in SyncProcessRunner injectable.

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 22 matching lines @@
     virtual SyncFileSystemService* GetSyncService() = 0;
   };
 
   class TimerHelper {
    public:
     virtual ~TimerHelper() {}
     virtual bool IsRunning() = 0;
     virtual void Start(const tracked_objects::Location& from_here,
                        const base::TimeDelta& delay,
                        const base::Closure& closure) = 0;
+    virtual base::TimeTicks Now() const = 0;
 
    protected:
     TimerHelper() {}
   };
 
   SyncProcessRunner(const std::string& name,
                     Client* client,
                     scoped_ptr<TimerHelper> timer_helper,
                     int max_parallel_task);
   virtual ~SyncProcessRunner();
@@ skipping 30 matching lines @@
   int64 last_delay_;
   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_