[webrtc-extensions] Add API to control WebRTC encoder, in particular to request key frame (#72)

youennf has just created a new issue for https://github.com/w3c/webrtc-extensions:

== Add API to control WebRTC encoder, in particular to request key frame ==
As show in https://github.com/w3c/webrtc-extensions/pull/37, there are use cases for more fine-grained control of encoders, in particular to trigger key frame generations.
Identified use cases
- SFrame encryption key change (related to webrtc-encoded-transform)
- Update bitrate and ask key frame request at the time of bitrate update

Please view or discuss this issue at https://github.com/w3c/webrtc-extensions/issues/72 using your GitHub account


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