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This is done by disabling anti aliasing. As we're painting a single
solid rectangle this is equivalent (and probably marginally faster).

Bug: chromium:907641
Change-Id: I05dec569b963511ce87f0a24d0f2f443fa0d9889
Reviewed-on: https://chromium-review.googlesource.com/c/1352338Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611380}