Add WebRTC insertable streams #5644
Description
- https://w3c.github.io/webrtc-insertable-streams/
- https://www.chromestatus.com/feature/6321945865879552
- webrtc insertable streams mozilla/standards-positions#330
Insertable streams are used by Jitsi to provide end-to-end encryption in conference calls: https://jitsi.org/e2ee-in-jitsi/