Add app to overview anim for Recents Go.

This CL adds the first iteration of window animation to go from
the app back to recents provided that the view is ready to be
visible to the user.

Bug: 114136250
Test: Go to recents, launch app, press overview to go back to recents
Change-Id: Ic0567e7c87fa964bdad25d07eca61b78407a9ff5