This makes it easier to refactor the interface in upcoming CLs. Bug: None Change-Id: I67d0216e24f087294e95ac96f7278f302bf69832 Reviewed-on: https://webrtc-review.googlesource.com/71041 Reviewed-by: Stefan Holmer <stefan@webrtc.org> Commit-Queue: Sebastian Jansson <srte@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22933}