Implement drawDRRect for GPU

src/gpu/GrOvalRenderer.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrOvalRenderer_DEFINED
 #define GrOvalRenderer_DEFINED
 
@@ skipping 15 matching lines @@
 
     GrOvalRenderer() : fRRectIndexBuffer(NULL) {}
     ~GrOvalRenderer() {
         this->reset();
     }
 
     void reset();
 
     bool drawOval(GrDrawTarget* target, const GrContext* context, bool useAA,
                   const SkRect& oval, const SkStrokeRec& stroke);
-    bool drawSimpleRRect(GrDrawTarget* target, GrContext* context, bool useAA,
-                         const SkRRect& rrect, const SkStrokeRec& stroke);
+    bool drawRRect(GrDrawTarget* target, GrContext* context, bool useAA,
+                   const SkRRect& rrect, const SkStrokeRec& stroke);
+    bool drawDRRect(GrDrawTarget* target, GrContext* context, bool useAA,
+                    const SkRRect& outer, const SkRRect& inner);
 
 private:
     bool drawEllipse(GrDrawTarget* target, bool useCoverageAA,
                      const SkRect& ellipse,
                      const SkStrokeRec& stroke);
     bool drawDIEllipse(GrDrawTarget* target, bool useCoverageAA,
                        const SkRect& ellipse,
                        const SkStrokeRec& stroke);
     void drawCircle(GrDrawTarget* target, bool useCoverageAA,
                     const SkRect& circle,
                     const SkStrokeRec& stroke);
 
     GrIndexBuffer* rRectIndexBuffer(GrGpu* gpu);
 
     GrIndexBuffer* fRRectIndexBuffer;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif // GrOvalRenderer_DEFINED