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 14660847fa2114b0138a4cfcdf33440d58f86f26..1480d9d205edff3133fd79dd7863fbf20e2d1c13 100644
--- a/talk/media/base/mediachannel.h
+++ b/talk/media/base/mediachannel.h
@@ -968,6 +968,10 @@ struct DataMediaInfo {
   std::vector<DataReceiverInfo> receivers;
 };
 
+struct RtcpParameters {
+  bool reduced_size = false;
+};
+
 template <class Codec>
 struct RtpParameters {
   virtual std::string ToString() {
@@ -982,6 +986,7 @@ struct RtpParameters {
   std::vector<Codec> codecs;
   std::vector<RtpHeaderExtension> extensions;
   // TODO(pthatcher): Add streams.
+  RtcpParameters rtcp;
 };
 
 template <class Codec, class Options>