Clean up GrCircleEdgeEffect and GrEllipseEdgeEffect

src/gpu/effects/GrCircleEdgeEffect.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 GrCircleEdgeEffect_DEFINED
 #define GrCircleEdgeEffect_DEFINED
 
@@ skipping 34 matching lines @@
     typedef GrGLCircleEdgeEffect GLEffect;
 
     virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
 
     inline bool isStroked() const { return fStroke; }
 
 private:
     GrCircleEdgeEffect(bool stroke);
 
     virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE {
-        return true;
+        const GrCircleEdgeEffect& cee = CastEffect<GrCircleEdgeEffect>(other);
+        return cee.fStroke == fStroke;
     }
 
     bool fStroke;
 
     GR_DECLARE_EFFECT_TEST;
 
     typedef GrEffect INHERITED;
 };
 
 #endif