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This gets called enough while painting that I think it's worth it.

Bug: 950063
Change-Id: I11c84087b9bb04fb0d4ba26b4eec4ada050e65e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1555040Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#648680}