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This CL changes video fullscreen tests to wait on one frame being
painted, in an attempt to make them more reliable. The CL also updates
the test expectations.

Bug: 1025291
Change-Id: I80de51215b1d009f6e5ae99e2808c9223cb89ce6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2025932Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737049}