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This CL uses video.requestVideoFrameCallback to guarantee a video frame
was displayed before ending the test.

Bug: 1083605, 1083609e
Change-Id: I6a6b3a4a3349ba35c301fe1c7998857c9f94d9ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2561746
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Auto-Submit: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831995}