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This will guard https://skia-review.googlesource.com/c/skia/+/158344
It introduces a few pixel_test diffs due to the test framework's
processing of images after read-back.

Bug: skia:8382
Change-Id: Id0ca8c4205a5537665610086db348145855dd8c4
Reviewed-on: https://chromium-review.googlesource.com/1255206
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595547}