Added varying struct

src/gpu/gl/builders/GrGLGeometryShaderBuilder.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLGeometryShaderBuilder_DEFINED
 #define GrGLGeometryShaderBuilder_DEFINED
 
 #include "GrGLShaderBuilder.h"
 
+class GrGLVarying;
+
 class GrGLGeometryBuilder : public GrGLShaderBuilder {
 public:
     GrGLGeometryBuilder(GrGLProgramBuilder* program);
+
+private:
     /*
      * an internal call for GrGLFullProgramBuilder to add varyings
      */
-    void addVarying(GrSLType type,
-                   const char* name,
-                   const char** gsOutName);
+    void addVarying(GrGLVarying* v);
 
     bool compileAndAttachShaders(GrGLuint programId, SkTDArray<GrGLuint>* shaderIds) const;
 
+    friend class GrGLProgramBuilder;
+
     typedef GrGLShaderBuilder INHERITED;
 };
 
 #endif