Introduce RtpStreamReceiver and RtpStreamReceiverControllerInterface.

webrtc/audio/audio_receive_stream.h

Index: webrtc/audio/audio_receive_stream.h
diff --git a/webrtc/audio/audio_receive_stream.h b/webrtc/audio/audio_receive_stream.h
index 7dcc6d3c53930b5a3be97c50278af7abbe1cfdd6..1d32520935af45469c316c868013d2417d707679 100644
--- a/webrtc/audio/audio_receive_stream.h
+++ b/webrtc/audio/audio_receive_stream.h
@@ -26,6 +26,8 @@ namespace webrtc {
 class PacketRouter;
 class RtcEventLog;
 class RtpPacketReceived;
+class RtpStreamReceiverControllerInterface;
+class RtpStreamReceiver;
 
 namespace voe {
 class ChannelProxy;
@@ -39,7 +41,8 @@ class AudioReceiveStream final : public webrtc::AudioReceiveStream,
                                  public Syncable,
                                  public RtpPacketSinkInterface {
  public:
-  AudioReceiveStream(PacketRouter* packet_router,
+  AudioReceiveStream(RtpStreamReceiverControllerInterface* receiver_controller,
+                     PacketRouter* packet_router,
                      const webrtc::AudioReceiveStream::Config& config,
                      const rtc::scoped_refptr<webrtc::AudioState>& audio_state,
                      webrtc::RtcEventLog* event_log);
@@ -87,6 +90,8 @@ class AudioReceiveStream final : public webrtc::AudioReceiveStream,
 
   bool playing_ ACCESS_ON(worker_thread_checker_) = false;
 
+  std::unique_ptr<RtpStreamReceiver> rtp_stream_receiver_;
+
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(AudioReceiveStream);
 };
 }  // namespace internal