Make XPFragmentBuilder only Builder with access to DstCopy.

src/gpu/GrDefaultGeoProcFactory.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDefaultGeoProcFactory.h"
 
 #include "GrInvariantOutput.h"
@@ skipping 68 matching lines @@
 
     class GLProcessor : public GrGLGeometryProcessor {
     public:
         GLProcessor(const GrGeometryProcessor& gp, const GrBatchTracker&)
             : fColor(GrColor_ILLEGAL), fCoverage(0xff) {}
 
         void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
             const DefaultGeoProc& gp = args.fGP.cast<DefaultGeoProc>();
             GrGLGPBuilder* pb = args.fPB;
             GrGLVertexBuilder* vsBuilder = pb->getVertexShaderBuilder();
-            GrGLGPFragmentBuilder* fs = args.fPB->getFragmentShaderBuilder();
+            GrGLFragmentBuilder* fs = args.fPB->getFragmentShaderBuilder();
             const BatchTracker& local = args.fBT.cast<BatchTracker>();
 
             // emit attributes
             vsBuilder->emitAttributes(gp);
 
             // Setup pass through color
             this->setupColorPassThrough(pb, local.fInputColorType, args.fOutputColor, gp.inColor(),
                                         &fColorUniform);
             // Setup position
             this->setupPosition(pb, gpArgs, gp.inPosition()->fName, gp.viewMatrix());
@@ skipping 177 matching lines @@
                                                            const SkMatrix& localMatrix,
                                                            bool opaqueVertexColors,
                                                            uint8_t coverage) {
     return DefaultGeoProc::Create(gpTypeFlags,
                                   color,
                                   viewMatrix,
                                   localMatrix,
                                   opaqueVertexColors,
                                   coverage);
 }