Initial error handling code

include/core/SkRasterizer.h

Index: include/core/SkRasterizer.h
diff --git a/include/core/SkRasterizer.h b/include/core/SkRasterizer.h
index 3e662ab2c1b0e6bbf4996d81fad9563ceef97013..6f18c4c5de9a062e2966639eb5a4087a29d42f27 100644
--- a/include/core/SkRasterizer.h
+++ b/include/core/SkRasterizer.h
@@ -19,6 +19,8 @@ class SkPath;
 struct SkIRect;
 
 class SK_API SkRasterizer : public SkFlattenable {
+    typedef SkFlattenable INHERITED;
+
 public:
     SK_DECLARE_INST_COUNT(SkRasterizer)
 
@@ -30,15 +32,14 @@ public:
                    const SkIRect* clipBounds, SkMaskFilter* filter,
                    SkMask* mask, SkMask::CreateMode mode) const;
 
+    SK_DEFINE_FLATTENABLE_TYPE(SkRasterizer)
+
 protected:
     SkRasterizer(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {}
 
     virtual bool onRasterize(const SkPath& path, const SkMatrix& matrix,
                              const SkIRect* clipBounds,
                              SkMask* mask, SkMask::CreateMode mode) const;
-
-private:
-    typedef SkFlattenable INHERITED;
 };
 
 #endif