Chris Craik 91a8c7c629 Switch to cos interpolation of shadow alpha
bug:16852257

Updates default shadow opacities to compensate.

Also, update variable/constant naming related to vertex alpha.

Change-Id: I9055b4ac3c9ac305ca9d515f21b52d6aa6dc9c5c
2014-08-12 16:00:09 -07:00
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