promote SkImage::AlphaType to SkAlphaType

gm/image.cpp

Index: gm/image.cpp
diff --git a/gm/image.cpp b/gm/image.cpp
index 6dada0d9492c14c93fe4e275c810d363d9e0cf39..e9378be0e20a7edae475900b7c559316a5b04a71 100644
--- a/gm/image.cpp
+++ b/gm/image.cpp
@@ -178,12 +178,9 @@ protected:
         // since we draw into this directly, we need to start fresh
         sk_bzero(fBuffer, fBufferSize);
 
-        SkImage::Info info;
-
-        info.fWidth = W;
-        info.fHeight = H;
-        info.fColorType = SkImage::kPMColor_ColorType;
-        info.fAlphaType = SkImage::kPremul_AlphaType;
+        SkImage::Info info = {
+            W, H, SkImage::kPMColor_ColorType, kPremul_SkAlphaType
+        };
         SkAutoTUnref<SkSurface> surf0(SkSurface::NewRasterDirect(info, fBuffer, RB));
         SkAutoTUnref<SkSurface> surf1(SkSurface::NewRaster(info));
         SkAutoTUnref<SkSurface> surf2(SkSurface::NewPicture(info.fWidth, info.fHeight));