4.4 implementation of active display

Change-Id: I08330a28d0880f82c09ccaec7e36844d9e6570d5

Conflicts:
	core/java/android/app/INotificationManager.aidl
	core/res/AndroidManifest.xml
	packages/SystemUI/AndroidManifest.xml
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
	services/java/com/android/server/NotificationManagerService.java