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

talk/media/base/mediachannel.h

Index: talk/media/base/mediachannel.h
diff --git a/talk/media/base/mediachannel.h b/talk/media/base/mediachannel.h
index 2509cb025e9834b19d9c145bbd6cca9df663595e..b661cbfd7edbd97fab5fc27db28381c4e5ac4753 100644
--- a/talk/media/base/mediachannel.h
+++ b/talk/media/base/mediachannel.h
@@ -928,6 +928,10 @@ struct DataMediaInfo {
   std::vector<DataReceiverInfo> receivers;
 };
 
+struct RtcpParameters {
+  bool reduced_size = false;
+};
+
 template <class Codec>
 struct RtpParameters {
   virtual std::string ToString() const {
@@ -942,6 +946,7 @@ struct RtpParameters {
   std::vector<Codec> codecs;
   std::vector<RtpHeaderExtension> extensions;
   // TODO(pthatcher): Add streams.
+  RtcpParameters rtcp;
 };
 
 template <class Codec, class Options>