This is a prerequisite to implementing it externally. Bug: webrtc:11525 Change-Id: I9cb3b4418396485d3eb9f25cafa51cbff6db7817 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/176401 Commit-Queue: Henrik Boström <hbos@webrtc.org> Reviewed-by: Stefan Holmer <stefan@webrtc.org> Reviewed-by: Evan Shrubsole <eshr@google.com> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31418}