Cast: Restructure RTCP interface to better fit our usage.

media/cast/rtcp/rtcp_receiver.h

Index: media/cast/rtcp/rtcp_receiver.h
diff --git a/media/cast/rtcp/rtcp_receiver.h b/media/cast/rtcp/rtcp_receiver.h
index 585f86117406565d6735c11a17d411968e879a76..a2d98407091d6ce17af1abe3fc821368964c690a 100644
--- a/media/cast/rtcp/rtcp_receiver.h
+++ b/media/cast/rtcp/rtcp_receiver.h
@@ -22,6 +22,12 @@ class RtcpReceiverFeedback {
 
   virtual void OnReceivedSendReportRequest() = 0;
 
+  virtual void OnReceivedReceiverLog(
+      const RtcpReceiverLogMessage& receiver_log) = 0;
+
+  virtual void OnReceivedSenderLog(
+      const RtcpSenderLogMessage& sender_log) = 0;
+
   virtual ~RtcpReceiverFeedback() {}
 };