To prevent tap-jacking, filter touches to the enable button if there is another window obscuring the screen. Bug: 11242907 Change-Id: I0228cd480faf8e7ebf70394d9bb60fa2e4138fb4
Change-Id: I27920668191742ab032de7b71c8f71cc35432e9f
Change-Id: I5822bf4a81f5ade4ee0649ed30c2daa40d7e8fe2