Make XPFragmentBuilder only Builder with access to DstCopy.

src/gpu/effects/GrConfigConversionEffect.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrConfigConversionEffect.h"
 #include "GrContext.h"
 #include "GrInvariantOutput.h"
@@ skipping 15 matching lines @@
                           const GrFragmentProcessor&,
                           const char* outputColor,
                           const char* inputColor,
                           const TransformedCoordsArray& coords,
                           const TextureSamplerArray& samplers) override {
         // Using highp for GLES here in order to avoid some precision issues on specific GPUs.
         GrGLShaderVar tmpVar("tmpColor", kVec4f_GrSLType, 0, kHigh_GrSLPrecision);
         SkString tmpDecl;
         tmpVar.appendDecl(builder->ctxInfo(), &tmpDecl);
 
-        GrGLFPFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
+        GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
 
         fsBuilder->codeAppendf("%s;", tmpDecl.c_str());
 
         fsBuilder->codeAppendf("%s = ", tmpVar.c_str());
         fsBuilder->appendTextureLookup(samplers[0], coords[0].c_str(), coords[0].getType());
         fsBuilder->codeAppend(";");
 
         if (GrConfigConversionEffect::kNone_PMConversion == fPMConversion) {
             SkASSERT(fSwapRedAndBlue);
             fsBuilder->codeAppendf("%s = %s.bgra;", outputColor, tmpVar.c_str());
@@ skipping 242 matching lines @@
             kNone_PMConversion != pmConversion) {
             // The PM conversions assume colors are 0..255
             return NULL;
         }
         return SkNEW_ARGS(GrConfigConversionEffect, (texture,
                                                      swapRedAndBlue,
                                                      pmConversion,
                                                      matrix));
     }
 }