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We are using touch events to handle pen inputs, and when we convert
ui::touchevent to WebTouchEvent, some of the pointer properties are not
carried to WebPointerProperties. Because ui::touchevent are converted
to MotionEvent first, which does not have these attributes. Now we are
adding them to MotionEvent to pass these values to WebTouchEvent.

Bug: 867612

Change-Id: I44a262f0810791169cf2dae45c9131b8bb708927
Reviewed-on: https://chromium-review.googlesource.com/1150578
Commit-Queue: Lan Wei <lanwei@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580531}