Alan Viverette 4d971c1fa0 Set alpha channel correctly when recomputing gradient
The alpha channel is applied by modulateAlpha(). Setting it to
mAlpha in ensureValidRect() locked the maximum alpha channel to
whatever value was set before layout. Setting it to BLACK
ensures it can be modulated later.

BUG: 10514848
Change-Id: If7a824410a66f1e9b648e20ee627bdf99a42ae78
2013-08-28 10:24:12 -07:00
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