Add more specialized fragment builders

src/gpu/glsl/GrGLSLFragmentProcessor.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLSLFragmentProcessor.h"
 #include "GrFragmentProcessor.h"
 #include "GrProcessor.h"
@@ skipping 10 matching lines @@
 }
 
 void GrGLSLFragmentProcessor::emitChild(int childIndex, const char* inputColor, EmitArgs& args) {
     this->internalEmitChild(childIndex, inputColor, args.fOutputColor, args);
 }
 
 void GrGLSLFragmentProcessor::emitChild(int childIndex, const char* inputColor,
                                         SkString* outputColor, EmitArgs& args) {
 
     SkASSERT(outputColor);
-    GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
+    GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
     outputColor->append(fragBuilder->getMangleString());
     fragBuilder->codeAppendf("vec4 %s;", outputColor->c_str());
     this->internalEmitChild(childIndex, inputColor, outputColor->c_str(), args);
 }
 
 void GrGLSLFragmentProcessor::internalEmitChild(int childIndex, const char* inputColor,
                                                 const char* outputColor, EmitArgs& args) {
-    GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
+    GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
 
     fragBuilder->onBeforeChildProcEmitCode();  // call first so mangleString is updated
 
     const GrFragmentProcessor& childProc = args.fFp.childProcessor(childIndex);
 
     /*
      * We now want to find the subset of coords and samplers that belong to the child and its
      * descendants and put that into childCoords and childSamplers. To do so, we'll do a forwards
      * linear search.
      *
@@ skipping 49 matching lines @@
                        childProc,
                        outputColor,
                        inputColor,
                        childCoords,
                        childSamplers);
     this->childProcessor(childIndex)->emitCode(childArgs);
     fragBuilder->codeAppend("}\n");
 
     fragBuilder->onAfterChildProcEmitCode();
 }