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Fix pip activity remained in PAUSING state
The enter-pip activity was reparented to a newly created task because the original host task contains more than one activity. However, the pip activity remained in PAUSING state because the task pausing activity was null and therefore the activity didn't schedule to pause. Bug: 213541422 Test: atest PinnedStackTests Change-Id: I1aea45f70eb3983dc9859585321258813ee62af7