according to webrtc-svc spec draft Bug: webrtc:11404 Change-Id: I318b8a1a5c5389f6e5d15c3dd7d93041459e37f9 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/178603 Reviewed-by: Philip Eliasson <philipel@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31731}