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With r277082, raw touch locations are now exposed to the gesture detector.
Plumb these raw locations into the generated gesture events, in turn populating
the WebGestureEvent.global{X,Y} properties.

BUG=383690

Review URL: https://codereview.chromium.org/349463002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278672 0039d316-1c4b-4281-b951-d872f2087c98