This CL adds tracking and reporting of packet feedback availability in
the AudioSendStream class.
This is part of a series of CLs tracking the transport feedback status
of the streams known to BitrateAllocator and reporting the status to
the congestion controller.
Bug: webrtc:8415
Change-Id: I1053675d245a59c1b97fd482de88e63cbfae0038
Reviewed-on: https://webrtc-review.googlesource.com/63203
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Oskar Sundbom <ossu@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22539}
763e947cf3