1. Tanslating contents of RecentsView instead of recentsView itself. When
translating, we keep the current TaskView from moving. This allows
the remoteTarget to follow an individual taskView.
2. Removing translationY in recentsView and setting the pivot instead
3. Using TaskViewSimulator for swipe handler. This allows using similar
animation creation as Launcher window animation.
Change-Id: I0b7b16c367d9d8cd8dd0ed59061e46853e2f8c83