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The specific test is PanXYAtAutoXOverlapAreaMainThreadJanky.
In this test, we added some jank to the main thread, and I believe that
is causing the flakiness. We expect it to scroll along the X direction
for at least 22 pixels. In the result, it does scroll 20 pixels. Since
we are adding the jank to the main thread which could make the test
scroll with unexpected scroll amount, we should just make sure that it
does scrolled instead of comparing the scrolled amount.

Bug: 850715
Change-Id: I0452ac7e4cc7af1f9c9be616bd160d44c1bf7930
Reviewed-on: https://chromium-review.googlesource.com/1092878
Commit-Queue: Xida Chen <xidachen@chromium.org>
Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566029}