This allows callers to use timestamps generated from their own clocks without worrying about converting to webrtc time. No-Try because of lack of infra lack of capacity on macs. No-Try: True Bug: webrtc:11327 Change-Id: I7b1935654a2b23cf844c7b3622ed68763ced9da5 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/219785 Commit-Queue: Paul Hallak <phallak@google.com> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Minyue Li <minyue@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34076}