Cast: Cap max receiver log size per rtcp packet to 200 bytes.

media/cast/rtcp/rtcp_sender.h

Index: media/cast/rtcp/rtcp_sender.h
diff --git a/media/cast/rtcp/rtcp_sender.h b/media/cast/rtcp/rtcp_sender.h
index 5cc3bef91bf28f9e21a86607c1fca95cffc5e0f7..ac64f9bbd7a4f261310ec67142979b9613d0eb4e 100644
--- a/media/cast/rtcp/rtcp_sender.h
+++ b/media/cast/rtcp/rtcp_sender.h
@@ -19,6 +19,12 @@
 namespace media {
 namespace cast {
 
+// We limit the size of receiver logs to avoid queuing up packets. We also
+// do not need the amount of redundancy that results from filling up every
+// RTCP packet with log messages. This number should give a redundancy of
+// about 2-3 per log message.
+const size_t kMaxReceiverLogBytes = 200;
+
 class ReceiverRtcpEventSubscriber;
 
 // TODO(mikhal): Resolve duplication between this and RtcpBuilder.