Material Design Team fd840cbf9a The foundation part of the Dynamic Persistent Sheet concept implementation
This change adds all the foundation code needed:
+ demo in the Catalog,
+ persistentsheet package with 2 classes:
  * PersistentSheet,
  * PersistentSheetTransformationBehavior

Instead of a proper expansion animation, a placeholder animation copied from FAB transformations is added. Proper animations to be added later.

PiperOrigin-RevId: 162641104
2017-09-21 12:13:02 -04:00
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