AddPlayoutSink    355 content/renderer/media/media_stream_audio_processor.cc       playout_data_source_->AddPlayoutSink(this);
AddPlayoutSink    258 content/renderer/media/webrtc_audio_device_impl.h   virtual void AddPlayoutSink(Sink* sink) = 0;
AddPlayoutSink    398 content/renderer/media/webrtc_audio_device_impl.h   virtual void AddPlayoutSink(WebRtcPlayoutDataSource::Sink* sink) OVERRIDE;