This groups functions for WebRtcVideoSendChannel and WebRtcVideoReceiveChannel together, rather than interspersing them. Bug: webrtc:13931 Change-Id: Iecb5bac18e1d370331e9eb546c6b2fde4d92963f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/309460 Commit-Queue: Harald Alvestrand <hta@webrtc.org> Reviewed-by: Florent Castelli <orphis@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40312}