Loss notifications may either be sent immediately, or wait until another RTCP feedback message is sent. Bug: webrtc:10336 Change-Id: I40601d9fa1dec6c17b2ce905cb0c8cd2dcff7893 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/139242 Commit-Queue: Elad Alon <eladalon@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28142}