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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. This CL we should replace
eventSender.mouseScrollBy with wheelTick which uses
gpuBenchmarking.smoothScrollByXY in
third_party/blink/web_tests/plugins/transformed-events.html and also
gpuBenchmarking.pointerActionSequence to generate touch, mouse and
gesture events.

Bug: 1047176
Change-Id: I08321de0e43cde7293ca017aae2270863af2401d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2262497
Commit-Queue: Lan Wei <lanwei@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785916}