Renderer side audio device change wip...

media/base/audio_renderer_mixer.h

Index: media/base/audio_renderer_mixer.h
diff --git a/media/base/audio_renderer_mixer.h b/media/base/audio_renderer_mixer.h
index c25e1d813623b600a4a5dd537e131834c5d3f434..d7c903ec5594ab2e8e4dc425e85f5480e420602c 100644
--- a/media/base/audio_renderer_mixer.h
+++ b/media/base/audio_renderer_mixer.h
@@ -30,6 +30,9 @@ class MEDIA_EXPORT AudioRendererMixer
   void AddMixerInput(const scoped_refptr<AudioRendererMixerInput>& input);
   void RemoveMixerInput(const scoped_refptr<AudioRendererMixerInput>& input);
 
+  const AudioParameters& input_params() { return input_params_; }
+  const AudioParameters& output_params() { return output_params_; }
+
   void set_pause_delay_for_testing(base::TimeDelta delay) {
     pause_delay_ = delay;
   }
@@ -39,6 +42,7 @@ class MEDIA_EXPORT AudioRendererMixer
   virtual int Render(AudioBus* audio_bus,
                      int audio_delay_milliseconds) OVERRIDE;
   virtual void OnRenderError() OVERRIDE;
+  virtual void OnDeviceChange() OVERRIDE;
 
   // Output sink for this mixer.
   scoped_refptr<AudioRendererSink> audio_sink_;
@@ -59,6 +63,9 @@ class MEDIA_EXPORT AudioRendererMixer
   base::Time last_play_time_;
   bool playing_;
 
+  AudioParameters input_params_;
+  AudioParameters output_params_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioRendererMixer);
 };