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With Quad layers keeping the content quad high-res and crisp, we can
lower the buffer size of the rest of our UI which doesn't need to be as
high quality as the content quad.

The quality decrease is only barely noticeable on an A/B toggle, and
the performance win is huge (and necessary to get us back to 60fps on a
Pixel XL device).

Bug: 714304
Change-Id: I0f352f88789584e51815baafe0f25d69fb7e8780
Reviewed-on: https://chromium-review.googlesource.com/1024881Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552934}