Introduce RtpStreamReceiver and RtpStreamReceiverControllerInterface.

webrtc/video/rtp_video_stream_receiver.h

Index: webrtc/video/rtp_video_stream_receiver.h
diff --git a/webrtc/video/rtp_video_stream_receiver.h b/webrtc/video/rtp_video_stream_receiver.h
index e298803c3fbef00d7e24e4f27b58fa7b4cdd62da..5f951a032d6dbcdc1535cb583d8d5f9805357fce 100644
--- a/webrtc/video/rtp_video_stream_receiver.h
+++ b/webrtc/video/rtp_video_stream_receiver.h
@@ -19,6 +19,7 @@
 
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/criticalsection.h"
+#include "webrtc/call/rtp_packet_sink_interface.h"
 #include "webrtc/modules/include/module_common_types.h"
 #include "webrtc/modules/rtp_rtcp/include/receive_statistics.h"
 #include "webrtc/modules/rtp_rtcp/include/remote_ntp_time_estimator.h"
@@ -58,6 +59,7 @@ class VideoReceiver;
 class RtpVideoStreamReceiver : public RtpData,
                                public RecoveredPacketReceiver,
                                public RtpFeedback,
+                               public RtpPacketSinkInterface,
                                public VCMFrameTypeCallback,
                                public VCMPacketRequestCallback,
                                public video_coding::OnReceivedFrameCallback,
@@ -96,8 +98,8 @@ class RtpVideoStreamReceiver : public RtpData,
 
   void SignalNetworkState(NetworkState state);
 
-  // TODO(nisse): Intended to be part of an RtpPacketReceiver interface.
-  void OnRtpPacket(const RtpPacketReceived& packet);
+  // Implements RtpPacketSinkInterface.
+  void OnRtpPacket(const RtpPacketReceived& packet) override;
 
   // Implements RtpData.
   int32_t OnReceivedPayloadData(const uint8_t* payload_data,