There doesn't seem to be any tests currently running with VideoToolbox H.264 codec. Add a minimal test to make sure there are no regressions. Bug: webrtc:13934 Change-Id: I664833d06e9b4f919b0662781891f5448e6057c0 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/257922 Reviewed-by: Artem Titov <titovartem@webrtc.org> Commit-Queue: Daniel.L (Byoungchan) Lee <daniel.l@hpcnt.com> Cr-Commit-Position: refs/heads/main@{#36511}