Alan Viverette 12b61f20a4 Prevent RevealDrawable from drawing mask when layer is empty
Compositing the mask layer into an empty layer using SRC_IN will
actually composite into the layer UNDER the empty layer.

Change-Id: I5ba434b0d7e6a5bc707fe842a5db82ae33066912
2014-01-17 15:38:20 -08:00
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