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

include/core/SkRRect.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkRRect_DEFINED
 #define SkRRect_DEFINED
 
@@ skipping 206 matching lines @@
      *  given radius becomes negative, it is pinned to 0.
      *
      *  It is valid for dst == this.
      */
     void outset(SkScalar dx, SkScalar dy, SkRRect* dst) const {
         this->inset(-dx, -dy, dst);
     }
     void outset(SkScalar dx, SkScalar dy) {
         this->inset(-dx, -dy, this);
     }
+    
+    /**
+     * Translate the rrect by (dx, dy).
+     */
+    void offset(SkScalar dx, SkScalar dy) {
+        fRect.offset(dx, dy);
+    }
 
     /**
      *  Returns true if 'rect' is wholy inside the RR, and both
      *  are not empty.
      */
     bool contains(const SkRect& rect) const;
 
     SkDEBUGCODE(void validate() const;)
 
     enum {
@@ skipping 40 matching lines @@
     // uninitialized data
 
     void computeType() const;
     bool checkCornerContainment(SkScalar x, SkScalar y) const;
 
     // to access fRadii directly
     friend class SkPath;
 };
 
 #endif