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This CL makes sure all videos have produced a video frame before
proceeding to the next step of the test, by using the
requestVideoFrameCallback API.

video-object-fit-change.html still has a risk of flaking, since we
cannot use rVFC to be notified on object fits.

Bug: 963141
Change-Id: I17903cb9914977d113c8ba3093e2eb298328141a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2556497
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Auto-Submit: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831022}