Plumb render view ID from audio-related code in renderer through IPCs to AudioRendererHost in brows…

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..3127430826f0e2872168e1e3b4aff6df648e0b42 100644
--- a/content/renderer/media/audio_device_factory.h
+++ b/content/renderer/media/audio_device_factory.h
@@ -22,13 +22,19 @@ class CONTENT_EXPORT AudioDeviceFactory {
  public:
   // 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();
+  // pointer will be passed to the caller.  |render_view_id| refers to the
+  // source of the output.
+  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
   // interfaces.
-  static media::AudioInputDevice* NewInputDevice();
+  // Creates an AudioInputDevice using the currently registered factory, or the
+  // default one if no factory is registered.  Caller owns the returned object.
+  // |render_view_id| refers to the consumer of the input.
+  static media::AudioInputDevice* NewInputDevice(
+      int render_view_id);
 
  protected:
   AudioDeviceFactory();
@@ -38,8 +44,8 @@ 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::AudioInputDevice* CreateInputDevice() = 0;
+  virtual media::AudioRendererSink* CreateOutputDevice(int render_view_id) = 0;
+  virtual media::AudioInputDevice* CreateInputDevice(int render_view_id) = 0;
 
  private:
   // The current globally registered factory. This is NULL when we should