Add more specialized fragment builders

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 "SkPerlinNoiseShader.h"
 #include "SkColorFilter.h"
 #include "SkReadBuffer.h"
@@ skipping 576 matching lines @@
                                              stitchTiles ? &tileSize : nullptr));
 
     return shader->asFragmentProcessor(d->fContext,
                                        GrTest::TestMatrix(d->fRandom), nullptr,
                                        kNone_SkFilterQuality);
 }
 
 void GrGLPerlinNoise::emitCode(EmitArgs& args) {
     const GrPerlinNoiseEffect& pne = args.fFp.cast<GrPerlinNoiseEffect>();
 
-    GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
+    GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
     GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
     SkString vCoords = fragBuilder->ensureFSCoords2D(args.fCoords, 0);
 
     fBaseFrequencyUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
                                                    kVec2f_GrSLType, kDefault_GrSLPrecision,
                                                    "baseFrequency");
     const char* baseFrequencyUni = uniformHandler->getUniformCStr(fBaseFrequencyUni);
 
     const char* stitchDataUni = nullptr;
     if (pne.stitchTiles()) {
@@ skipping 362 matching lines @@
     str->append(" seed: ");
     str->appendScalar(fSeed);
     str->append(" stitch tiles: ");
     str->append(fStitchTiles ? "true " : "false ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif