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Touch event's position resolution could be quite different than the
display's resolution, e.g.  the display could be set as 1920x1080
while the touchscreen is reporting touch position range at 32767x32767.
Touch event's radius is reported in the units the same as touch position.
While we are doing touch position scaling, we should also do the same
for touch radius.

BUG=392172, 233245
TEST=touch radius is scaled to be reasonable value for HP 23TM
     touch monitor.

Review URL: https://codereview.chromium.org/412553005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285132 0039d316-1c4b-4281-b951-d872f2087c98