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Changed picker to stay as long as chooser is shown
Changed behavior of the picker to remain visible behind the viewer as long as the chooser is active. When the chooser is dismissed or an option is selected the picker will finish. Test: Manual, verified that picker remains visible until the chooser is acted upon. Bug: 32413513 Change-Id: I520e25de19d2290b0e52ce2212856afd6e3ee06e