1. For animation spec, before, we only consider animation to/from
left/right. Now, we also check top/bottom.
2. For animation adapter, before, we always use the window end bounds,
which may be empty when closing a window that is also resizing during
the transition. Now, for closing window, we use the start bounds
instead.
Bug: 241043533
Test: Verify with launching activity into horizontal split.
Test: Verify with switching between split and stack.
Change-Id: I4fddcb2327d05e90b0c12605490fa7d7aa987fa0
60040ea71f