b84ad63b0a
This is a proposal for a new RTCP message. Feel free to comment on the message structure, selected type ids etc, as well as code for serialization/deserialization. Once we agree on this, I'll continue with wiring it up in the actual rtcp sender and receiver. BUG=webrtc:6301 Review-Url: https://codereview.webrtc.org/2306873003 Cr-Commit-Position: refs/heads/master@{#14867}