Introduce media::TimeSource.

media/filters/video_renderer_impl.h

Index: media/filters/video_renderer_impl.h
diff --git a/media/filters/video_renderer_impl.h b/media/filters/video_renderer_impl.h
index 0f142be3520509a1e7b3ac200ea601b5f4f6701a..68a80003e456367dc84b15e044c9eaaf19902d76 100644
--- a/media/filters/video_renderer_impl.h
+++ b/media/filters/video_renderer_impl.h
@@ -60,14 +60,13 @@ class MEDIA_EXPORT VideoRendererImpl
                           bool low_delay,
                           const PipelineStatusCB& init_cb,
                           const StatisticsCB& statistics_cb,
-                          const TimeCB& max_time_cb,
                           const BufferingStateCB& buffering_state_cb,
                           const base::Closure& ended_cb,
                           const PipelineStatusCB& error_cb,
                           const TimeDeltaCB& get_time_cb,
                           const TimeDeltaCB& get_duration_cb) OVERRIDE;
   virtual void Flush(const base::Closure& callback) OVERRIDE;
-  virtual void StartPlayingFrom(base::TimeDelta timestamp) OVERRIDE;
+  virtual void StartPlaying() OVERRIDE;
   virtual void Stop(const base::Closure& callback) OVERRIDE;
 
   // PlatformThread::Delegate implementation.
@@ -154,7 +153,7 @@ class MEDIA_EXPORT VideoRendererImpl
   //         |
   //         V            Decoders reset
   //      kFlushed <------------------ kFlushing
-  //         | StartPlayingFrom()         ^
+  //         | StartPlaying()             ^
   //         |                            |
   //         |                            | Flush()
   //         `---------> kPlaying --------'
@@ -185,7 +184,6 @@ class MEDIA_EXPORT VideoRendererImpl
   // Event callbacks.
   PipelineStatusCB init_cb_;
   StatisticsCB statistics_cb_;
-  TimeCB max_time_cb_;
   BufferingStateCB buffering_state_cb_;
   base::Closure ended_cb_;
   PipelineStatusCB error_cb_;