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paint_preview_utils will be used in an experiment. To this end it should
have test coverage and be refactored/cleaner. This also fixes a crash
that occurred in some situations.

Bug: 1049128
Change-Id: I66b031bd518996a13fdaedd437b80ce8c646bf8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2038081Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739065}