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This adds a virtual/video-surface-layer/ that runs with the feature
enabled and uses a flag to properly do pixel comparison using browser
compositor in addition of the renderer compositor.

Bug: 838128
Change-Id: I2bd7306b156b1e49e1404f5f3b3803b8e6771d4b
Reviewed-on: https://chromium-review.googlesource.com/1034289
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: CJ DiMeglio <lethalantidote@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555610}