Add nine patch type to SkRRect.

src/effects/SkBlurMaskFilter.cpp

Index: src/effects/SkBlurMaskFilter.cpp
diff --git a/src/effects/SkBlurMaskFilter.cpp b/src/effects/SkBlurMaskFilter.cpp
index a5cdc4f703990b2e7f3ab2cbbb5eeb494e5494ef..ff98daf048181bec780ebfd6df271fc53b807c0e 100644
--- a/src/effects/SkBlurMaskFilter.cpp
+++ b/src/effects/SkBlurMaskFilter.cpp
@@ -288,10 +288,10 @@ SkBlurMaskFilterImpl::filterRRectToNine(const SkRRect& rrect, const SkMatrix& ma
             // already have code for rectangles.
             return kUnimplemented_FilterReturn;
 
+        // These three can take advantage of this fast path.
         case SkRRect::kSimple_Type:
-            // Fall through.
+        case SkRRect::kNinePatch_Type:
         case SkRRect::kComplex_Type:
-            // These can take advantage of this fast path.
             break;
     }