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SetNeedsDisplay() was being called many times, when every other test
limits it to a certain number of times. This test should only call it
once, and doing so prevents it from running wildly and flaking on the
single threaded versions.

Bug: 1111302, 1112507
Change-Id: I2038c89e73b7b92b03133a4cf8487a9a54467fb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343221Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Mario Bianucci <mabian@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#796523}