[2/2] Framework: add option to hide power menu when screen is locked

Change-Id: I0de1501d0ecedb7b9b08fbb3aebaecd0e63cc09e
fb: slightly adjust navigationring background drawable size

for custom icons to fit the system icons

Change-Id: I068cd0a463484f0f1b3ed0f210701290be364b7a
fb: fix possible NPE on back button transition

Change-Id: Ia6e30a9d94f292e7616b846f159b61fed9f502cc
fb: refactor QuietHours code

thanks to ivisiblk for the idea

Change-Id: I56e2b4a1945a4b93251b9937b701c86168b732b4

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