Make XPFragmentBuilder only Builder with access to DstCopy.

src/effects/SkPerlinNoiseShader.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDither.h"
 #include "SkPerlinNoiseShader.h"
 #include "SkColorFilter.h"
@@ skipping 629 matching lines @@
 }
 
 void GrGLPerlinNoise::emitCode(GrGLFPBuilder* builder,
                                const GrFragmentProcessor&,
                                const char* outputColor,
                                const char* inputColor,
                                const TransformedCoordsArray& coords,
                                const TextureSamplerArray& samplers) {
     sk_ignore_unused_variable(inputColor);
 
-    GrGLFPFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
+    GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
     SkString vCoords = fsBuilder->ensureFSCoords2D(coords, 0);
 
     fBaseFrequencyUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                             kVec2f_GrSLType, kDefault_GrSLPrecision,
                                             "baseFrequency");
     const char* baseFrequencyUni = builder->getUniformCStr(fBaseFrequencyUni);
     fAlphaUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                     kFloat_GrSLType, kDefault_GrSLPrecision,
                                     "alpha");
     const char* alphaUni = builder->getUniformCStr(fAlphaUni);
@@ skipping 371 matching lines @@
     str->append(" seed: ");
     str->appendScalar(fSeed);
     str->append(" stitch tiles: ");
     str->append(fStitchTiles ? "true " : "false ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif