Introduce RtpStreamReceiver and RtpStreamReceiverControllerInterface.

webrtc/call/flexfec_receive_stream_impl.h

Index: webrtc/call/flexfec_receive_stream_impl.h
diff --git a/webrtc/call/flexfec_receive_stream_impl.h b/webrtc/call/flexfec_receive_stream_impl.h
index e4c22942e62f3ce203fcc77b3813622bbc278229..06d59675a1fe1395da90db839f09351e56118829 100644
--- a/webrtc/call/flexfec_receive_stream_impl.h
+++ b/webrtc/call/flexfec_receive_stream_impl.h
@@ -26,11 +26,14 @@ class RecoveredPacketReceiver;
 class RtcpRttStats;
 class RtpPacketReceived;
 class RtpRtcp;
+class RtpTransportControllerReceiveInterface;
+class RtpTransportReceiver;
 
 class FlexfecReceiveStreamImpl : public FlexfecReceiveStream,
                                  public RtpPacketSinkInterface {
  public:
-  FlexfecReceiveStreamImpl(const Config& config,
+  FlexfecReceiveStreamImpl(RtpTransportControllerReceiveInterface* transport,
+                           const Config& config,
                            RecoveredPacketReceiver* recovered_packet_receiver,
                            RtcpRttStats* rtt_stats,
                            ProcessThread* process_thread);
@@ -59,6 +62,8 @@ class FlexfecReceiveStreamImpl : public FlexfecReceiveStream,
   const std::unique_ptr<ReceiveStatistics> rtp_receive_statistics_;
   const std::unique_ptr<RtpRtcp> rtp_rtcp_;
   ProcessThread* process_thread_;
+
+  std::unique_ptr<RtpTransportReceiver> rtp_transport_receiver_;
 };
 
 }  // namespace webrtc