[1/2] Base: Option to enable Notification Light when screen is on

This makes it possible to let the Notification LED flash even when the screen is on

Change-Id: I58be9646cdc84d4765342a5ab45b4641c3d5daba

Conflicts:
	core/java/android/provider/Settings.java
	services/java/com/android/server/NotificationManagerService.java

Conflicts:
	services/java/com/android/server/NotificationManagerService.java
[2/2] Framework: instant led test

Adds support a new notification extra boolean
EXTRA_FORCE_SHOW_LIGHTS.  Used by settings
notification light picker to force lights on
when the screen is on.

Change-Id: If0a42d32b28fe8c02ef5f7dd148db7eb478fac17

Conflicts:
	services/java/com/android/server/NotificationManagerService.java

Conflicts:
	services/java/com/android/server/NotificationManagerService.java