Chrome doesn't have monochrome pixel format support, since we expect
this usage to be rare, just create fake UV planes for these video
types.

Also adds test data and hashing for a couple of existing tests which
was disabled at launch.

Fixed: 1083840
Test: New unittests. Manual inspection.
Change-Id: I3b30d4da30abc4c39bbdc1f5f611ca56b229d710
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208012
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769915}