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All of these tests are currently flaky because they sometimes render
without a video frame. Utilize the requestVideoFrameCallback() API to
wait for a video frame callback before deciding that the tests are done.

Where needed, make sure that test and ref use the same condition for
when the test (and ref) should be considered completed.

This appears to reduce the rate at which these tests flake, but not
completely eliminate the flakiness.

Bug: 988248
Change-Id: Ib999646942ec2b1247da6ec61bd4a80a2e8bfbf1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208866Reviewed-by: srirama chandra sekhar <srirama.m@samsung.com>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#770711}