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After we finish the scroll unification, the scrolls happens mainly on
the compositor thread, and the scroll code in the main thread will be
removed. eventSender sends the scroll events to main thread, so it
would not work after the scroll unification. We rewrite below tests
fast/scroll-behavior/main-frame-interrupted-scroll.html,
fast/scroll-behavior/overflow-interrupted-scroll.html and
fast/scroll-behavior/subframe-interrupted-scroll.html into browser tests
because we cannot guarantee that the scroll arrives before the animation
completes.

TBR=bokan@chromium.org

Bug: 1047176

Change-Id: I46a6cb0697b8a74ff260aafbc2fc60a7d65ae1a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446534Reviewed-by: Lan Wei <lanwei@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814707}