pie toggle, rootbox icons

Change-Id: I765fa63ee6a3cc169992aaea7bb79c81278e0dfa

Conflicts:
	packages/SystemUI/res/drawable-hdpi/ic_qs_expanded_desktop.png
	packages/SystemUI/res/drawable-hdpi/ic_qs_expanded_desktop_off.png
	packages/SystemUI/res/drawable-xhdpi/ic_qs_expanded_desktop.png
	packages/SystemUI/res/drawable-xhdpi/ic_qs_expanded_desktop_off.png