Add more specialized fragment builders

src/gpu/glsl/GrGLSLFragmentProcessor.cpp

Index: src/gpu/glsl/GrGLSLFragmentProcessor.cpp
diff --git a/src/gpu/glsl/GrGLSLFragmentProcessor.cpp b/src/gpu/glsl/GrGLSLFragmentProcessor.cpp
index 649bd99deab6ee36396636334afcf6d4b2d6d6dd..ac3d734c90b9852a42dae4cb1e92e67e3611806b 100644
--- a/src/gpu/glsl/GrGLSLFragmentProcessor.cpp
+++ b/src/gpu/glsl/GrGLSLFragmentProcessor.cpp
@@ -28,7 +28,7 @@ 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);
@@ -36,7 +36,7 @@ void GrGLSLFragmentProcessor::emitChild(int childIndex, const char* inputColor,
 
 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