Zero out GrSamplerState in constructor to recover performance loss on Linux from r4102. (Noise in padding bytes was breaking operator==()) Visual review by bsalomon@.
Zero out GrSamplerState in constructor to recover performance loss on Linux from r4102.
(Noise in padding bytes was breaking operator==())
Visual review by bsalomon@.



git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@4108 2bbb7eff-a529-9590-31e7-b0007b416f81

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