Resync libwebrtc with M87 latest branch.
This means cherry-picking a1aa01aad0 and 69202b2a57.
Created attachment 418268 [details]
Created attachment 418270 [details]
Committed r271793: <https://trac.webkit.org/changeset/271793>
All reviewed patches have been landed. Closing bug and clearing flags on attachment 418268 [details].
Reopening to attach new patch.
Created attachment 418287 [details]