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In GpuBenchmarking, for mouse wheel and touchpad scroll, we want to add
"scroll_by_page" scroll option to GpuBenchmarking::SmoothScrollBy.

Bug: 871970
Change-Id: If73cc2bb41a77499cfc6215b5d8fde09f33f6caa
Reviewed-on: https://chromium-review.googlesource.com/1174993
Commit-Queue: Lan Wei <lanwei@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Sahel Sharify <sahel@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585656}