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When the screen turns on because of an incoming phone call or when the emergency dialer is selected, FaceUnlock is deactivated until the phone call is completed and the screen is turned off. This also checks for non-phone overlays. If the lockscreen becomes unfocused while the screen is on, we assume that the reason is an overlay and prevent FaceUnlock from starting. The normal clock app is not considered an overlay by this approach, and thus it works as intended (back button brings up FaceUnlock). Also reverts: https://android-git.corp.google.com/g/#/c/139885/2 to make FaceUnlock appear when music is playing again Change-Id: Id715878556667d2b7e35c30a28d91be6a4eee575