Halo: selectively add boost hints 

boost only at the start of moving the halo for both reversed and regular
interactions.  Also boost for launching tasks.

-VanirAOSP

Change-Id: I910fa0b13205f80c84894f252ed3668f887d4fed

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/halo/Halo.java

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/halo/Halo.java