664644d9e0
1. Views may setSystemUiVisibility() to recommend that the system chrome (status bar or other UI) show or hide itself. (This functionality was previously available only via the FLAG_FULLSCREEN window flag for some SystemUI implementations.) 2. Views may register a OnSystemUiVisibilityChangedListener on a view, and find out when the system UI actually appears or disappears, allowing apps to coordinate the appearance of their own UI if desired. Bug: 3241144 Change-Id: Ia1758d94099182d49a1e3688ea2738ae4995b829