This is a part of series of CLs adding PCC (Performance-oriented
Congestion Control).
Bug: webrtc:9434
Change-Id: Idd36d8abea008623ac64b939d0de7ee6001f7f23
Reviewed-on: https://webrtc-review.googlesource.com/86951
Commit-Queue: Anastasia Koloskova <koloskova@webrtc.org>
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24364}