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This CL ensures that buffers that require a horizontal flip transform
are not promoted to overlays. The reason why this is needed is that
support for this transform is dependent on the buffer layout (e.g., on
some devices, linear buffers with a horizontal flip transform cannot be
scanned out). Unfortunately, page flip testing does not currently use
real buffers, so we could end up promoting a buffer to an overlay plane
incorrectly.

Horizontally flipped linear buffers are used in the camera capture app.
They can also be used by web pages that use getUserMedia() plus CSS.

Bug: b:161758029, b:168899960
Test: launch the camera capture app on JSL
Change-Id: I24df6c8e0820ce391e5699de3cb906f348df9ec2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434911
Commit-Queue: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811375}