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To simplify the use of the scroll function, we can use the smoothScroll
function in gesture-util.js instead of
chrome.gpuBenchmarking.smoothScrollBy in all the layout tests.

Bug: 1047176
Change-Id: I6764bd72e42d54a2623b453a808061f96d045687
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2115798Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752620}