Wale Ogunwale 99db1863a8 Added support for pinned stack.
Used to support picture-in-picture use case for multi-window

Bug: 25006507
Change-Id: I3bef3f75e0c003f5974274294f1250171d424625
2015-10-26 11:17:33 -07:00
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2015-10-26 11:17:33 -07:00