Add GM that directly tests GrRRectEffect and add inverse fill version of effect.

src/gpu/effects/GrRRectEffect.h

Index: src/gpu/effects/GrRRectEffect.h
diff --git a/src/gpu/effects/GrRRectEffect.h b/src/gpu/effects/GrRRectEffect.h
index 45dac0154f424af4a406110d835474fb14b2ab98..7df7e6f0762d0eada19185163fc6838205109c70 100644
--- a/src/gpu/effects/GrRRectEffect.h
+++ b/src/gpu/effects/GrRRectEffect.h
@@ -14,11 +14,20 @@ class GrEffectRef;
 class SkRRect;
 
 namespace GrRRectEffect {
+    enum EdgeType {
+        kFillAA_EdgeType,
+        kInverseFillAA_EdgeType,
+        
+        kLastEdgeType = kInverseFillAA_EdgeType,
+    };
+    
+    static const int kEdgeTypeCnt = kLastEdgeType + 1;
+
     /**
      * Creates an effect that performs anti-aliased clipping against a SkRRect. It doesn't support
      * all varieties of SkRRect so the caller must check for a NULL return.
      */
-    GrEffectRef* Create(const SkRRect&);
+    GrEffectRef* Create(EdgeType, const SkRRect&);
 };
 
 #endif