These implementations have been copied from Chromium and adapted to
build and run in WebRTC's environment.
Bug: webrtc:12689
Change-Id: Id8ff5d86b00827102a6be9d613fad7864130d013
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/224661
Commit-Queue: Victor Boivie <boivie@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34425}
