Merge AssociateStreamWithProducer message into CreateStream message for both audio output and input.

content/renderer/media/webrtc_audio_capturer.h

Index: content/renderer/media/webrtc_audio_capturer.h
diff --git a/content/renderer/media/webrtc_audio_capturer.h b/content/renderer/media/webrtc_audio_capturer.h
index e9b927a9790c6133ba361d3f28a80e1b023dff64..7c209d21120fc5a56ead19cd01ce2c06b415eb73 100644
--- a/content/renderer/media/webrtc_audio_capturer.h
+++ b/content/renderer/media/webrtc_audio_capturer.h
@@ -52,9 +52,10 @@ class CONTENT_EXPORT WebRtcAudioCapturer
   static scoped_refptr<WebRtcAudioCapturer> CreateCapturer();
 
   // Creates and configures the default audio capturing source using the
-  // provided audio parameters.
-  // Called on the main render thread.
-  bool Initialize(media::ChannelLayout channel_layout, int sample_rate);
+  // provided audio parameters.  |render_view_id| specifies the render view
+  // consuming audio for capture.  Called on the main render thread.
+  bool Initialize(int render_view_id,
+                  media::ChannelLayout channel_layout, int sample_rate);
 
   // Called by the client on the sink side to add a sink.
   // WebRtcAudioDeviceImpl calls this method on the main render thread but