HALO smoother operation

Change-Id: I8c906e969077c826f168a2c452d56d2ce49f78a8

Conflicts:

	packages/SystemUI/src/com/android/systemui/statusbar/halo/Halo.java
	packages/SystemUI/src/com/android/systemui/statusbar/halo/HaloProperties.java
halo crash?

Change-Id: Iba879efa0a5178e55f9a615d3c760e7926cf165e