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The only remaining platform is linux which doesn't ship GPU raster
currently. This change switches any test code using GPU raster on linux
to OOPR.

R=sunnyps@chromium.org
Bug:757605

Change-Id: I5c14c9d7bc423307156e3ca6b091d263036ac4b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439895
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Auto-Submit: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812995}