Accelerate handling of clipRRect in calls to SkPictureUtils::GatherPixelRefs
Accelerate handling of clipRRect in calls to SkPictureUtils::GatherPixelRefs

BUG=https://code.google.com/p/chromium/issues/detail?id=173718
Review URL: https://codereview.appspot.com/7252048

git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@7527 2bbb7eff-a529-9590-31e7-b0007b416f81

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