Support for remote audio into tracks

talk/app/webrtc/mediastreaminterface.h

Index: talk/app/webrtc/mediastreaminterface.h
diff --git a/talk/app/webrtc/mediastreaminterface.h b/talk/app/webrtc/mediastreaminterface.h
index 00782cb2a5eef66d515869733ab7c5b234b9802c..5327bd2f12f2b3164df79c3a9f011c876180cdb6 100644
--- a/talk/app/webrtc/mediastreaminterface.h
+++ b/talk/app/webrtc/mediastreaminterface.h
@@ -167,6 +167,8 @@ class AudioSourceInterface : public MediaSourceInterface {
   // TODO(xians): Makes all the interface pure virtual after Chrome has their
   // implementations.
   // Sets the volume to the source. |volume| is in  the range of [0, 10].
+  // TODO(tommi): This method should be on the track and ideally volume should
+  // be applied in the track in a way that does not affect clones of the track.
   virtual void SetVolume(double volume) {}
 
   // Registers/unregisters observer to the audio source.