Experiment for the nack module.

webrtc/video/video_receive_stream.cc

Index: webrtc/video/video_receive_stream.cc
diff --git a/webrtc/video/video_receive_stream.cc b/webrtc/video/video_receive_stream.cc
index 32fb3e5cc86bc3c54ab170134df1134406efa58b..cd487ac5d388ea6c6684a87338fe5671e275f0f3 100644
--- a/webrtc/video/video_receive_stream.cc
+++ b/webrtc/video/video_receive_stream.cc
@@ -159,7 +159,11 @@ VideoReceiveStream::VideoReceiveStream(
       congestion_controller_(congestion_controller),
       call_stats_(call_stats),
       remb_(remb),
-      vcm_(VideoCodingModule::Create(clock_, nullptr, nullptr)),
+      vcm_(VideoCodingModule::Create(clock_,
+                                     nullptr,
+                                     nullptr,
+                                     this,
+                                     this)),
       incoming_video_stream_(
           0,
           config.renderer ? config.renderer->SmoothsRenderedFrames() : false),
@@ -424,5 +428,14 @@ void VideoReceiveStream::Decode() {
   vcm_->Decode(kMaxDecodeWaitTimeMs);
 }
 
+void VideoReceiveStream::SendNack(
+    const std::vector<uint16_t>& sequence_numbers) {
+  rtp_rtcp_->SendNack(sequence_numbers);
+}
+
+void VideoReceiveStream::RequestKeyFrame() {
+  rtp_rtcp_->RequestKeyFrame();
+}
+
 }  // namespace internal
 }  // namespace webrtc