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This CL adds a smoke test for the scaling of paint previews.

Bug: 1106035
Change-Id: I70db04a8dd83466f585f9c2949bf923b6bce8740
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2310893
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790862}