GitLab

When we have keyboard events and mouse events send together, we should
set key modifies in mouse events. This test first presses some keys
then send some mouse events. This test only works on Chrome.

Bug: 606367

TBR=nzolghadr@chromium.org

Change-Id: Idad0bcca2c03f961f6c6af211d7f843f06e14fc1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1544170Reviewed-by: Lan Wei <lanwei@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653672}