Add GrEllipseEdgeEffect

include/gpu/GrEffect.h

Index: include/gpu/GrEffect.h
===================================================================
--- include/gpu/GrEffect.h	(revision 7952)
+++ include/gpu/GrEffect.h	(working copy)
@@ -136,6 +136,12 @@
     /** Shortcut for textureAccess(index).texture(); */
     GrTexture* texture(int index) const { return this->textureAccess(index).getTexture(); }
 
+
+    int numVertexAttribs() const { return fVertexAttribNames.count(); }
+
+    const char* vertexAttribName(int index) const { return fVertexAttribNames[index]; }
+
+
     /** Useful for effects that want to insert a texture matrix that is implied by the texture
         dimensions */
     static inline SkMatrix MakeDivByTextureWHMatrix(const GrTexture* texture) {
@@ -168,12 +174,19 @@
 
 protected:
     /**
-     * Subclasses call this from their constructor to register GrTextureAcceses. The effect subclass
-     * manages the lifetime of the accesses (this function only stores a pointer). This must only be
-     * called from the constructor because GrEffects are supposed to be immutable.
+     * Subclasses call this from their constructor to register GrTextureAccesses. The effect 
+     * subclass manages the lifetime of the accesses (this function only stores a pointer). This 
+     * must only be called from the constructor because GrEffects are immutable.
      */
     void addTextureAccess(const GrTextureAccess* textureAccess);
 
+    /**
+     * Subclasses call this from their constructor to register names to be bound as vertex 
+     * attributes. The effect subclass manages the lifetime of the name (this function only stores 
+     * a pointer). This must only be called from the constructor because GrEffects are immutable.
+     */
+    void addVertexAttribName(const char* attrName);
+
     GrEffect() : fEffectRef(NULL) {};
 
     /** This should be called by GrEffect subclass factories. See the comment on AutoEffectUnref for
@@ -247,6 +260,7 @@
                                 // to inc/dec deferred ref counts.
 
     SkSTArray<4, const GrTextureAccess*, true>  fTextureAccesses;
+    SkSTArray<2, const char*, true>             fVertexAttribNames;
     GrEffectRef*                                fEffectRef;
 
     typedef GrRefCnt INHERITED;