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The video hole doesn't make practical use of the overlay API. Rather
than pretend to show anything via overlays, just replace the video quad
with a transparent quad.

This also allows the video hole to work with Ozone platforms other than
Cast since the Ozone platform is no longer expected to lie about
supporting the video hole overlay.

Bug: b/74998539
Test: Played video on device
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: Ia9b63f718d16ab8d933221a3ce551dbbf06b5748
Reviewed-on: https://chromium-review.googlesource.com/970910Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Sergey Volk <servolk@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548780}