Clean up GrCircleEdgeEffect and GrEllipseEdgeEffect

src/gpu/effects/GrEllipseEdgeEffect.h

Index: src/gpu/effects/GrEllipseEdgeEffect.h
===================================================================
--- src/gpu/effects/GrEllipseEdgeEffect.h	(revision 8302)
+++ src/gpu/effects/GrEllipseEdgeEffect.h	(working copy)
@@ -50,8 +50,9 @@
 private:
     GrEllipseEdgeEffect(bool stroke);
 
-    virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE {
-        return true;
+    virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE {
+        const GrEllipseEdgeEffect& eee = CastEffect<GrEllipseEdgeEffect>(other);
+        return eee.fStroke == fStroke;
     }
 
     bool fStroke;