In https://webrtc-review.googlesource.com/c/src/+/244420, I added sanity check of RTCVideoFrame in RTCMTLVideoView, but I forgot to modify the related tests. Fix this by adding the appropriate property stubs to RTCVideoFrame stubs created in RTCMTLVideoViewTests. Bug: webrtc:13990, webrtc:13490 Change-Id: I21f0f75cd052e4255e1eee5f39ffdd50c2f8e61b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/260420 Reviewed-by: Peter Hanspers <peterhanspers@webrtc.org> Reviewed-by: Jeremy Leconte <jleconte@google.com> Reviewed-by: Kári Helgason <kthelgason@webrtc.org> Commit-Queue: Daniel.L (Byoungchan) Lee <daniel.l@hpcnt.com> Cr-Commit-Position: refs/heads/main@{#36714}