OverlayMask make the overlay mask smarter than before, it's fits with w/h:100%/100% on good browsers now.
OverlayMask make the overlay mask smarter than before, it's fits with w/h:100%/100% on good browsers now.

git-svn-id: eaac6977d0b6fa3343c402860739874625caf655@40160 05bdf26c-840f-0410-9ced-eb539d925f36

giros/alloy-ui,giros/alloy-ui,giros/alloy-ui,giros/alloy-ui