Initial error handling code

src/effects/SkBlurMaskFilter.cpp

Index: src/effects/SkBlurMaskFilter.cpp
diff --git a/src/effects/SkBlurMaskFilter.cpp b/src/effects/SkBlurMaskFilter.cpp
index 6a5a39778cb73a6b1bdeeaf62a221437da389c34..916fd710ac6be1a8fb8fb134945820f9620fdba1 100644
--- a/src/effects/SkBlurMaskFilter.cpp
+++ b/src/effects/SkBlurMaskFilter.cpp
@@ -23,6 +23,8 @@
 #endif
 
 class SkBlurMaskFilterImpl : public SkMaskFilter {
+    typedef SkMaskFilter INHERITED;
+
 public:
     SkBlurMaskFilterImpl(SkScalar sigma, SkBlurMaskFilter::BlurStyle, uint32_t flags);
 
@@ -74,8 +76,6 @@ private:
         SkScalar xformedSigma = ignoreTransform ? fSigma : ctm.mapRadius(fSigma);
         return SkMinScalar(xformedSigma, kMAX_BLUR_SIGMA);
     }
-
-    typedef SkMaskFilter INHERITED;
 };
 
 const SkScalar SkBlurMaskFilterImpl::kMAX_BLUR_SIGMA = SkIntToScalar(128);
@@ -106,6 +106,26 @@ SkMaskFilter* SkBlurMaskFilter::Create(SkBlurMaskFilter::BlurStyle style,
     return SkNEW_ARGS(SkBlurMaskFilterImpl, (sigma, style, flags));
 }
 
+SkFlattenable::Factory SkBlurMaskFilter::GetFactory(SkFlattenable::Type type) {
+    switch(type) {
+    case SkFlattenable::kSkBlurMaskFilterImpl:
+        return SkBlurMaskFilterImpl::CreateProc;
+    default:
+        break;
+    }
+    return NULL;
+}
+
+SkFlattenable::TypeCheck SkBlurMaskFilter::GetTypeCheck(SkFlattenable::Type type) {
+    switch(type) {
+    case SkFlattenable::kSkBlurMaskFilterImpl:
+        return SkBlurMaskFilterImpl::IsA;
+    default:
+        break;
+    }
+    return NULL;
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 SkBlurMaskFilterImpl::SkBlurMaskFilterImpl(SkScalar sigma,