Make media::AudioRenderer inherit from media::TimeSource.

media/base/pipeline.h

 // Copyright (c) 2012 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 MEDIA_BASE_PIPELINE_H_
 #define MEDIA_BASE_PIPELINE_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
@@ skipping 16 matching lines @@
 class TimeDelta;
 }
 
 namespace media {
 
 class FilterCollection;
 class MediaLog;
 class TextRenderer;
 class TextTrackConfig;
 class TimeDeltaInterpolator;
+class TimeSource;
 class VideoRenderer;
 
 // Metadata describing a pipeline once it has been initialized.
 struct PipelineMetadata {
   PipelineMetadata()
       : has_audio(false), has_video(false), video_rotation(VIDEO_ROTATION_0) {}
 
   bool has_audio;
   bool has_video;
   gfx::Size natural_size;
@@ skipping 263 matching lines @@
   //   - A waiting to non-waiting transition indicates preroll has completed
   //     and StartPlayback() should be called
   //   - A non-waiting to waiting transition indicates underflow has occurred
   //     and PausePlayback() should be called
   void BufferingStateChanged(BufferingState* buffering_state,
                              BufferingState new_buffering_state);
   bool WaitingForEnoughData() const;
   void PausePlayback();
   void StartPlayback();
 
-  void PauseClockAndStopRendering_Locked();
+  void PauseClockAndStopTicking_Locked();
   void StartClockIfWaitingForTimeUpdate_Locked();
 
   // Task runner used to execute pipeline tasks.
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   // MediaLog to which to log events.
   scoped_refptr<MediaLog> media_log_;
 
   // Lock used to serialize access for the following data members.
   mutable base::Lock lock_;
@@ skipping 82 matching lines @@
 
   // Holds the initialized demuxer. Used for seeking. Owned by client.
   Demuxer* demuxer_;
 
   // Holds the initialized renderers. Used for setting the volume,
   // playback rate, and determining when playback has finished.
   scoped_ptr<AudioRenderer> audio_renderer_;
   scoped_ptr<VideoRenderer> video_renderer_;
   scoped_ptr<TextRenderer> text_renderer_;
 
+  // Renderer-provided time source used to control playback.
+  TimeSource* time_source_;
+
   PipelineStatistics statistics_;
 
   scoped_ptr<SerialRunner> pending_callbacks_;
 
   bool underflow_disabled_for_testing_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(Pipeline);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_H_