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}