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

media/filters/audio_renderer_impl.h

Index: media/filters/audio_renderer_impl.h
diff --git a/media/filters/audio_renderer_impl.h b/media/filters/audio_renderer_impl.h
index 6986562f22f6318b4a0109fb287ac86b093c080d..28d62abb0bfc9693e01858ab6b2af4cd589fd881 100644
--- a/media/filters/audio_renderer_impl.h
+++ b/media/filters/audio_renderer_impl.h
@@ -29,6 +29,7 @@
 #include "media/base/audio_renderer.h"
 #include "media/base/audio_renderer_sink.h"
 #include "media/base/decryptor.h"
+#include "media/base/time_source.h"
 #include "media/filters/audio_renderer_algorithm.h"
 #include "media/filters/decoder_stream.h"
 
@@ -47,6 +48,7 @@ class DecryptingDemuxerStream;
 
 class MEDIA_EXPORT AudioRendererImpl
     : public AudioRenderer,
+      public TimeSource,
       NON_EXPORTED_BASE(public AudioRendererSink::RenderCallback) {
  public:
   // |task_runner| is the thread on which AudioRendererImpl will execute.
@@ -65,6 +67,13 @@ class MEDIA_EXPORT AudioRendererImpl
       AudioHardwareConfig* hardware_params);
   virtual ~AudioRendererImpl();
 
+  // TimeSource implementation.
+  virtual void StartTicking() OVERRIDE;
+  virtual void StopTicking() OVERRIDE;
+  virtual void SetPlaybackRate(float rate) OVERRIDE;
+  virtual void SetMediaTime(base::TimeDelta time) OVERRIDE;
+  virtual base::TimeDelta CurrentMediaTime() OVERRIDE;
+
   // AudioRenderer implementation.
   virtual void Initialize(DemuxerStream* stream,
                           const PipelineStatusCB& init_cb,
@@ -73,12 +82,9 @@ class MEDIA_EXPORT AudioRendererImpl
                           const BufferingStateCB& buffering_state_cb,
                           const base::Closure& ended_cb,
                           const PipelineStatusCB& error_cb) OVERRIDE;
-  virtual void StartRendering() OVERRIDE;
-  virtual void StopRendering() OVERRIDE;
-  virtual void SetMediaTime(base::TimeDelta time) OVERRIDE;
+  virtual TimeSource* GetTimeSource() OVERRIDE;
   virtual void Flush(const base::Closure& callback) OVERRIDE;
   virtual void Stop(const base::Closure& callback) OVERRIDE;
-  virtual void SetPlaybackRate(float rate) OVERRIDE;
   virtual void StartPlaying() OVERRIDE;
   virtual void SetVolume(float volume) OVERRIDE;