Add support for unmixed audio from remote WebRTC remote tracks.

content/renderer/media/webrtc_local_audio_track.h

Index: content/renderer/media/webrtc_local_audio_track.h
diff --git a/content/renderer/media/webrtc_local_audio_track.h b/content/renderer/media/webrtc_local_audio_track.h
index dab159f9357d09df457d036fc2d95be667b2ce1e..bf02f4b5c114a02b4b3f37872930bb73b9ddc38b 100644
--- a/content/renderer/media/webrtc_local_audio_track.h
+++ b/content/renderer/media/webrtc_local_audio_track.h
@@ -37,7 +37,7 @@ class WebRtcLocalAudioTrackAdapter;
 // WebRtcAudioCapturer to get the captured data, and forward the data to
 // its |sinks_|. The data flow can be stopped by disabling the audio track.
 class CONTENT_EXPORT WebRtcLocalAudioTrack

[perkj_chrome, 2015/12/11 12:31:38]

todo rename to match your MediaStreamRemoteAudioTrack? (again depending on if
you want to separate local or remote tracks in the end or not.

[tommi (sloooow) - chröme, 2015/12/11 15:36:51]

Done. (added TODO since the full separation is a little further out)

-    : NON_EXPORTED_BASE(public MediaStreamTrack) {
+    : NON_EXPORTED_BASE(public MediaStreamAudioTrack) {
  public:
   WebRtcLocalAudioTrack(WebRtcLocalAudioTrackAdapter* adapter,
                         const scoped_refptr<WebRtcAudioCapturer>& capturer,
@@ -48,11 +48,11 @@ class CONTENT_EXPORT WebRtcLocalAudioTrack
   // Add a sink to the track. This function will trigger a OnSetFormat()
   // call on the |sink|.
   // Called on the main render thread.
-  void AddSink(MediaStreamAudioSink* sink);
+  void AddSink(MediaStreamAudioSink* sink) override;
 
   // Remove a sink from the track.
   // Called on the main render thread.
-  void RemoveSink(MediaStreamAudioSink* sink);
+  void RemoveSink(MediaStreamAudioSink* sink) override;
 
   // Starts the local audio track. Called on the main render thread and
   // should be called only once when audio track is created.
@@ -71,7 +71,7 @@ class CONTENT_EXPORT WebRtcLocalAudioTrack
   // Returns the output format of the capture source. May return an invalid
   // AudioParameters if the format is not yet available.
   // Called on the main render thread.
-  media::AudioParameters GetOutputFormat() const;
+  media::AudioParameters GetOutputFormat() const override;
 
   // Method called by the capturer to deliver the capture data.
   // Called on the capture audio thread.