Add a 'remote' property to MediaSourceInterface. Also adding an implementation to the relevant sour…

talk/app/webrtc/remoteaudiosource.h

 /*
  * libjingle
  * Copyright 2014 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 38 matching lines @@
 // This class implements the audio source used by the remote audio track.
 class RemoteAudioSource : public Notifier<AudioSourceInterface> {
  public:
   // Creates an instance of RemoteAudioSource.
   static rtc::scoped_refptr<RemoteAudioSource> Create(
       uint32_t ssrc,
       AudioProviderInterface* provider);
 
   // MediaSourceInterface implementation.
   MediaSourceInterface::SourceState state() const override;
+  bool remote() const override;
 
   void AddSink(AudioTrackSinkInterface* sink);
   void RemoveSink(AudioTrackSinkInterface* sink);
 
  protected:
   RemoteAudioSource();
   ~RemoteAudioSource() override;
 
   // Post construction initialize where we can do things like save a reference
   // to ourselves (need to be fully constructed).
@@ skipping 17 matching lines @@
   AudioObserverList audio_observers_;
   rtc::CriticalSection sink_lock_;
   std::list<AudioTrackSinkInterface*> sinks_;
   rtc::Thread* const main_thread_;
   SourceState state_;
 };
 
 }  // namespace webrtc
 
 #endif  // TALK_APP_WEBRTC_REMOTEAUDIOSOURCE_H_