Using this flag, an encoder may inform the RTP sender module that the packet is not elligible for retransmission. Specifically, it may not be retransmitted in response to a NACK message, nor because of early loss detection (see CL #135881). Bug: webrtc:10702 Change-Id: Ib6a9cc361cf10ea7214cf672e05940c27899a6be Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/140105 Commit-Queue: Elad Alon <eladalon@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28169}