Add GrEllipseEdgeEffect

src/gpu/gl/GrGLEffect.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 GrGLEffect_DEFINED
 #define GrGLEffect_DEFINED
 
@@ skipping 69 matching lines @@
     /** A GrGLEffect instance can be reused with any GrEffect that produces the same stage
         key; this function reads data from a stage and uploads any uniform variables required
         by the shaders created in emitCode(). The GrEffect installed in the GrEffectStage is
         guaranteed to be of the same type that created this GrGLEffect and to have an identical
         EffectKey as the one that created this GrGLEffect. */
     virtual void setData(const GrGLUniformManager&, const GrEffectStage&);
 
     const char* name() const { return fFactory.name(); }
 
     static EffectKey GenTextureKey(const GrEffectRef*, const GrGLCaps&);
+    static EffectKey GenAttribKey(const GrEffectStage& stage);
 
    /**
     * GrGLEffect subclasses get passed a GrEffectStage in their emitCode and setData functions.
     * The GrGLEffect usually needs to cast the stage's effect to the GrEffect subclass that
     * generated the GrGLEffect. This helper does just that.
     */
     template <typename T>
     static const T& GetEffectFromStage(const GrEffectStage& effectStage) {
         GrAssert(NULL != effectStage.getEffect());
         return CastEffect<T>(*effectStage.getEffect());
     }
 
    /**
     * Extracts the GrEffect from a GrEffectRef and down-casts to a GrEffect subclass. Usually used
     * in a GrGLEffect subclass's constructor (which takes const GrEffectRef&).
     */
     template <typename T>
     static const T& CastEffect(const GrEffectRef& effectRef) {
         GrAssert(NULL != effectRef.get());
         return *static_cast<const T*>(effectRef.get());
     }
 
 protected:
     const GrBackendEffectFactory& fFactory;
 };
 
 #endif