This CL adds reporting of per packet feedback availability from Call
via RtpTransportControllerSend to SendSideCongestionController.
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: I20b3dbb4a027c46476bc2d2bc875374bff05609a
Reviewed-on: https://webrtc-review.googlesource.com/63220
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22566}
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