Base: allow to determine dominant color for notifications icon

this also fix current color after screen off

Change-Id: I7af3210a67219cf6af85852a108081aa784681e9

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/BarTransitions.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarTransitions.java