Implement NVPR on GLES

src/gpu/effects/GrVertexEffect.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 GrVertexEffect_DEFINED
 #define GrVertexEffect_DEFINED
 
 #include "GrEffect.h"
 
 /**
  * If an effect needs specialized vertex shader code, then it must inherit from this class.
  * Otherwise it won't be able to add vertex attribs, and it might be given a vertexless shader
  * program in emitCode.
  */
 class GrVertexEffect : public GrEffect {
 public:
-    GrVertexEffect() { fHasVertexCode = true; }
+    GrVertexEffect() { fRequiresVertexShader = true; }
 
 protected:
     /**
      * Subclasses call this from their constructor to register vertex attributes (at most
      * kMaxVertexAttribs). This must only be called from the constructor because GrEffects are
      * immutable.
      */
     void addVertexAttrib(GrSLType type) {
         SkASSERT(fVertexAttribTypes.count() < kMaxVertexAttribs);
         fVertexAttribTypes.push_back(type);
     }
 
 private:
     typedef GrEffect INHERITED;
 };
 
 #endif