Ensure bounds animination for expanding PiP window

The internal animation type maybe reset at the end of RecentsAnimation
following the repro path in bug comments. Ensure BOUNDS animation type
if we know for certain that we're expanding / collpasing the PiP window

Added also last reported multi-window and PiP mode in dumpsys. This is
for internal debug purpose only.

Bug: 137849660
Test: Manually, see b/137849660#comment9
Test: dumpsys activity -v all
Change-Id: I0b7d102ccb4bc27dd0e432d1022bc12a42a0c36d