Add more specialized fragment builders

src/gpu/effects/GrConvolutionEffect.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 "GrConvolutionEffect.h"
 #include "glsl/GrGLSLFragmentProcessor.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
@@ skipping 32 matching lines @@
                                                 kVec2f_GrSLType, kDefault_GrSLPrecision,
                                                 "Bounds");
     }
 
     int width = Gr1DKernelEffect::WidthFromRadius(ce.radius());
 
     fKernelUni = uniformHandler->addUniformArray(kFragment_GrShaderFlag,
                                                  kFloat_GrSLType, kDefault_GrSLPrecision,
                                                  "Kernel", width);
 
-    GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
+    GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
     SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 0);
 
     fragBuilder->codeAppendf("%s = vec4(0, 0, 0, 0);", args.fOutputColor);
 
     const GrGLSLShaderVar& kernel = uniformHandler->getUniformVariable(fKernelUni);
     const char* imgInc = uniformHandler->getUniformCStr(fImageIncrementUni);
 
     fragBuilder->codeAppendf("vec2 coord = %s - %d.0 * %s;", coords2D.c_str(), ce.radius(), imgInc);
 
     // Manually unroll loop because some drivers don't; yields 20-30% speedup.
@@ skipping 157 matching lines @@
     }
 
     bool useBounds = d->fRandom->nextBool();
     return GrConvolutionEffect::Create(d->fTextures[texIdx],
                                        dir,
                                        radius,
                                        kernel,
                                        useBounds,
                                        bounds);
 }