Translate LossNotification RTCP messages (sequence number to timestamp and additional information), then send the translted message onwards to the encoder. Bug: webrtc:10501 Change-Id: If2fd943f75c36cf813a83120318d8eefc8c595d2 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/131950 Commit-Queue: Elad Alon <eladalon@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27545}