This adds a field trial to change the pacing rate to pace
at a rate relative to max(bwe ,lower link capacity)
Bug: none
Change-Id: Ibe9ef3e08eb422e9abff6488780e82188958eeeb
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/248865
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35795}