Adding reduced size RTCP configuration down to the video stream level.

webrtc/video_send_stream.h

Index: webrtc/video_send_stream.h
diff --git a/webrtc/video_send_stream.h b/webrtc/video_send_stream.h
index 0c0af80ef7c41642dda170892b2201a2488ec9d7..d0e0c93a2bcdc7cdf1358fdc98c5b7a67972b86c 100644
--- a/webrtc/video_send_stream.h
+++ b/webrtc/video_send_stream.h
@@ -100,6 +100,9 @@ class VideoSendStream : public SendStream {
 
       std::vector<uint32_t> ssrcs;
 
+      // See RtcpMode for description.
+      RtcpMode rtcp_mode = RtcpMode::kCompound;
+
       // Max RTP packet size delivered to send transport from VideoEngine.
       size_t max_packet_size = kDefaultMaxPacketSize;