Frameworks:  Allow Custom Icon Tinting Option (1/2)

See ROMControl portion for comments.
Adding Zaph as a Reviewer.

Up to you now, team <3

Change-Id: I7b7085534ab2572807dc092cdb4b00e84ae97a02

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/NavigationBarView.java