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In order to improve the performance and eliminate the issues that the
fake mouse move events cause to the testing and web developers, we
should not send fake mouse move events during scroll. This is
implemented behind a flag.

We will update the hover effect after scroll finishes in a following
patch.

Bug: 877132
Change-Id: Iee838f50e0a52b5048081d79f91442ddf0467e8f
Reviewed-on: https://chromium-review.googlesource.com/c/1211907
Commit-Queue: Lan Wei <lanwei@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596049}