Craig Mautner 924d9b75d6 Force BlackSurface to be a black surface.
BlackSurface transparency was tracking animation transparency causing
background images to peek around the corners.

Fixes bug 4998851.

Change-Id: I48ac7bf5d0cc560b655c9f12faccda411985cbad
2012-05-06 14:27:44 -07:00
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