GitLab

If the output surface is displayed as an overlay plane and there is a
video underlay, make the primary plane blend with the underlay such that
the transparent video hole in the primary plane allows the video to
show.

Bug: b/74998539
Test: Ran on device and verified video shows
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I01fd6c325dd2e93f7781fbbf1619bca402998217
Reviewed-on: https://chromium-review.googlesource.com/1005808Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Sergey Volk <servolk@chromium.org>
Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550474}