Previously it was constrained to displayInfo.appWidth/appHeight which comes from PWM.getNonDecorDisplayWidth/Height, which includes the nav bar. Also adjust window layout to entire screen. This allows wallpaper to extend into the navigation bar region, important if the nav bar is hidden or transparent. Bug:10505328 Change-Id: Ia6057b9c57b476a48f3b2d8b6368fd631e944a3e