Initial error handling code

include/core/SkMaskFilter.h

Index: include/core/SkMaskFilter.h
diff --git a/include/core/SkMaskFilter.h b/include/core/SkMaskFilter.h
index fda1289c6e6386466902028de1acd265a926eefd..8065acf8483589451167e28533435cd723ae5388 100644
--- a/include/core/SkMaskFilter.h
+++ b/include/core/SkMaskFilter.h
@@ -33,6 +33,8 @@ class SkRasterClip;
     Blur and emboss are implemented as subclasses of SkMaskFilter.
 */
 class SK_API SkMaskFilter : public SkFlattenable {
+    typedef SkFlattenable INHERITED;
+
 public:
     SK_DECLARE_INST_COUNT(SkMaskFilter)
 
@@ -124,7 +126,7 @@ public:
     virtual void computeFastBounds(const SkRect& src, SkRect* dest) const;
 
     SkDEVCODE(virtual void toString(SkString* str) const = 0;)
-
+    SK_DEFINE_FLATTENABLE_TYPE(SkMaskFilter)
 protected:
     // empty for now, but lets get our subclass to remember to init us for the future
     SkMaskFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {}
@@ -172,8 +174,6 @@ private:
     bool filterPath(const SkPath& devPath, const SkMatrix& devMatrix,
                     const SkRasterClip&, SkBounder*, SkBlitter* blitter,
                     SkPaint::Style style) const;
-
-    typedef SkFlattenable INHERITED;
 };
 
 #endif