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The device may not always report the radii values for a touch event. In such
cases, instead of making up a default value, always use 0 so that it is easy to
determine if the radius is the real radius reported by the device or not. Also,
at the same time, make sure that the radius value sent to webkit follows the
spec. Also fix the radii adjustment for device-scale-factor.

BUG=128553
TEST=manually with test-pages

Review URL: https://chromiumcodereview.appspot.com/10383249

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138006 0039d316-1c4b-4281-b951-d872f2087c98