Reparent PiP to split screen on exit

When exiting PiP from a different orientation, reparent the PiP task to
split screen as we do in finishResize and orientation does not change.

Video: http://rcll/aaaaaabFQoRHlzixHdtY/dBQuk6juYvCIiO4zc9aHFP
Bug: 159617346
Test: manual, see video
Change-Id: Iafe1abb61d35cabdc46c172ae80f7e0886307ab7
1 file changed