The frame transformer is passed from RTPReceiverInterface through the library to be eventually set in ChannelReceive, where the frame transformation will occur in the follow-up CL. Insertable Streams Web API explainer: https://github.com/alvestrand/webrtc-media-streams/blob/master/explainer.md Design doc for WebRTC library changes: http://doc/1eiLkjNUkRy2FssCPLUp6eH08BZuXXoHfbbBP1ZN7EVk Bug: webrtc:11380 Change-Id: I5af06d1431047ef50d00e304cf95e92a832b4220 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/171872 Reviewed-by: Magnus Flodman <mflodman@webrtc.org> Reviewed-by: Tommi <tommi@webrtc.org> Reviewed-by: Per Åhgren <peah@webrtc.org> Commit-Queue: Marina Ciocea <marinaciocea@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30956}