setAllAppWinAnimators() for closing apps.

This makes sure the app windows get onExitAnimationDone() call when
the animation is done vs. when the activity is stopped which happens
later.

Bug: 64218925
Test: go/wm-smoke
Change-Id: Ia3bd5efb0cc9713758f1b4ca4765b4bd5e19542d
1 file changed