This prepares for making the BBR implementation more identical to the implementation in Quic, this is to ensure that results are comparable. Bug: webrtc:8415 Change-Id: I6b182246c988dd4a95681c063dcaa779088d0e99 Reviewed-on: https://webrtc-review.googlesource.com/76481 Reviewed-by: Stefan Holmer <stefan@webrtc.org> Commit-Queue: Sebastian Jansson <srte@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23356}