Implemented behind `WebRTC-Video-SimulcastIndependentFrameIds`. Bug: b/329063481 Change-Id: I683e567bb5b449f998be57ec3a11bb3b95e3ace4 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/343382 Commit-Queue: Philip Eliasson <philipel@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/main@{#41927}