Create xfer processor backend.

src/gpu/gl/builders/GrGLFragmentShaderBuilder.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 GrGLFragmentShaderBuilder_DEFINED
 #define GrGLFragmentShaderBuilder_DEFINED
 
@@ skipping 82 matching lines @@
     virtual const char* fragmentPosition() SK_OVERRIDE;
     virtual const char* dstColor() SK_OVERRIDE;
 
 private:
     // Private public interface, used by GrGLProgramBuilder to build a fragment shader
     void emitCodeToReadDstTexture();
     void enableCustomOutput();
     void enableSecondaryOutput();
     const char* getPrimaryColorOutputName() const;
     const char* getSecondaryColorOutputName() const;
-    void enableSecondaryOutput(const GrGLSLExpr4& inputColor, const GrGLSLExpr4& inputCoverage);
-    void combineColorAndCoverage(const GrGLSLExpr4& inputColor, const GrGLSLExpr4& inputCoverage);
     bool compileAndAttachShaders(GrGLuint programId, SkTDArray<GrGLuint>* shaderIds) const;
     void bindFragmentShaderLocations(GrGLuint programID);
 
     // As GLProcessors emit code, there are some conditions we need to verify.  We use the below
     // state to track this.  The reset call is called per processor emitted.
     bool hasReadDstColor() const { return fHasReadDstColor; }
     bool hasReadFragmentPosition() const { return fHasReadFragmentPosition; }
     void reset() {
         fHasReadDstColor = false;
         fHasReadFragmentPosition = false;
@@ skipping 40 matching lines @@
     bool fHasReadDstColor;
     bool fHasReadFragmentPosition;
 
     friend class GrGLNvprProgramBuilder;
     friend class GrGLProgramBuilder;
 
     typedef GrGLFPFragmentBuilder INHERITED;
 };
 
 #endif