Halo: selectively add boost hints

boost at the start of moving the halo bubble for both reversed and regular
interactions.  Also boost for launching tasks from halo.

-VanirAOSP

Change-Id: I910fa0b13205f80c84894f252ed3668f887d4fed

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/halo/Halo.java
RecentsPanelView: remove internal getter for isHighEndGfx()

if we're going to store this as a global we might as well set it in the construct
instead of looking for it every time the recents are inflated

Change-Id: Ic38e98e5cf2ae399d51b63089d7cb2ab3ac97f51