Fix math in coverage_to_alpha() (renamed coverage_to_partial_alpha()), behind a #define so that we can stage coping with the huge amount of rebaselining necessary.
Fix math in coverage_to_alpha() (renamed coverage_to_partial_alpha()), behind
a #define so that we can stage coping with the huge amount of rebaselining
necessary.

http://codereview.appspot.com/5696049/



git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@3243 2bbb7eff-a529-9590-31e7-b0007b416f81

MatChung/color-emoji.skia,MatChung/color-emoji.skia,Frankie-666/color-emoji.skia,Frankie-666/color-emoji.skia,hbwhlklive/color-emoji.skia,hbwhlklive/color-emoji.skia,MatChung/color-emoji.skia,Hankuo/color-emoji.skia,Frankie-666/color-emoji.skia,Frankie-666/color-emoji.skia,Hankuo/color-emoji.skia,Frankie-666/color-emoji.skia,hbwhlklive/color-emoji.skia,MatChung/color-emoji.skia,Frankie-666/color-emoji.skia,hbwhlklive/color-emoji.skia,MatChung/color-emoji.skia,MatChung/color-emoji.skia,Hankuo/color-emoji.skia,hbwhlklive/color-emoji.skia,Hankuo/color-emoji.skia,Hankuo/color-emoji.skia,hbwhlklive/color-emoji.skia,Hankuo/color-emoji.skia