Base: Floating window <> MultiWindow

use this patch if you want to merger Floating window and multiwindow

Change-Id: Ia30ea5beb1993908bd58d785f4174b3b93a3961a

Conflicts:
	core/java/android/app/Activity.java
	packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java

Conflicts:
	core/java/android/app/Activity.java
	services/java/com/android/server/am/ActivityManagerService.java