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Ensure consistent stack behind PIP when going to/from fullscreen.
- When a fullscreen activity enters PIP, we were previously always
bringing the home stack forward due to the return type being set
to HOME_ACTIVITY_TYPE, causing the home screen to be visible if
expanding PIP over a fullscreen activity and going back into PIP
immediately. This CL instead updates the return-to type to
reflect the stack that was currently open before the pinned task
was made fullscreen again to ensure that it is consistent when
entering PIP again.
Test: android.server.cts.ActivityManagerPinnedStackTests
Test: #testPipUnPipOverHome
Test: #testPipUnPipOverApp
Change-Id: Id5dd7db1f5a8040ff21190cc347eb6aae5893006