This is used by BBR which is introduced in a future CL.
Bug: webrtc:8415
Change-Id: Ie5b3e6e58b7c9c7a35fc21acb636103d7f5daec3
Reviewed-on: https://webrtc-review.googlesource.com/64920
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22643}