Add send transports to individual webrtc::Call streams.

webrtc/video_receive_stream.h

Index: webrtc/video_receive_stream.h
diff --git a/webrtc/video_receive_stream.h b/webrtc/video_receive_stream.h
index 95253366d358b749a204f99be9fb7fb2db919f61..e6130064125b5e386d1c65a23429bdb6bcd021bb 100644
--- a/webrtc/video_receive_stream.h
+++ b/webrtc/video_receive_stream.h
@@ -86,6 +86,10 @@ class VideoReceiveStream : public ReceiveStream {
   };
 
   struct Config {
+    Config() = delete;
+    explicit Config(newapi::Transport* rtcp_send_transport)
+        : rtcp_send_transport(rtcp_send_transport) {}
+
     std::string ToString() const;
 
     // Decoders for every payload that we can receive.
@@ -137,6 +141,9 @@ class VideoReceiveStream : public ReceiveStream {
       std::vector<RtpExtension> extensions;
     } rtp;
 
+    // Transport for outgoing packets (RTCP).
+    newapi::Transport* rtcp_send_transport = nullptr;
+
     // VideoRenderer will be called for each decoded frame. 'nullptr' disables
     // rendering of this stream.
     VideoRenderer* renderer = nullptr;