Part 1: Plumb render view ID to render host

content/renderer/media/audio_device_factory.h

Index: content/renderer/media/audio_device_factory.h
diff --git a/content/renderer/media/audio_device_factory.h b/content/renderer/media/audio_device_factory.h
index e95e487e88a95acc4f97077ac84206cd864d7c2f..397ba3484b81407b3764301ecb3e75acbde492d2 100644
--- a/content/renderer/media/audio_device_factory.h
+++ b/content/renderer/media/audio_device_factory.h
@@ -23,7 +23,8 @@ class CONTENT_EXPORT AudioDeviceFactory {
   // Creates an AudioRendererSink using the currently registered factory,
   // or the default one if no factory is registered. Ownership of the returned
   // pointer will be passed to the caller.
-  static media::AudioRendererSink* NewOutputDevice();
+  static media::AudioRendererSink* NewOutputDevice(
+      int render_view_id);
 
   // TODO(henrika): Update AudioInputDevice to inherit from an interface
   // similar to AudioRendererSink, but for input.  Same for the callback
@@ -38,7 +39,7 @@ class CONTENT_EXPORT AudioDeviceFactory {
   // functions to provide alternate audio device implementations.
   // If the return value of either of these function is NULL, we fall back
   // on the default implementation.
-  virtual media::AudioRendererSink* CreateOutputDevice() = 0;
+  virtual media::AudioRendererSink* CreateOutputDevice(int render_view_id) = 0;
   virtual media::AudioInputDevice* CreateInputDevice() = 0;
 
  private: