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In https://codereview.chromium.org/12983010/

reversed_root_transform is passed into event::UpdateForRootTransform.

Then for TouchEvent::UpdateForRootTransform(), the radius_x/y now
should times the inverted device scale factor instead of being
divided by it. The same in ScrollEvent::UpdateForRootTransform() for
scroll offset ordinal.

BUG=chromium:226169
TEST=On Link, visit http://www.rbyers.net/paint.html, make sure
     touch radius has normal range.

Review URL: https://chromiumcodereview.appspot.com/13594009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192490 0039d316-1c4b-4281-b951-d872f2087c98