Added mangleString member and onBefore*, onAfter* functions to GrGLFragmentShaderBuilder

src/gpu/gl/builders/GrGLFragmentShaderBuilder.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 "GrGLFragmentShaderBuilder.h"
 #include "GrGLProgramBuilder.h"
 #include "gl/GrGLGpu.h"
@@ skipping 282 matching lines @@
     }
 }
 
 void GrGLFragmentShaderBuilder::addVarying(GrGLVarying* v, GrSLPrecision fsPrec) {
     v->fFsIn = v->fVsOut;
     if (v->fGsOut) {
         v->fFsIn = v->fGsOut;
     }
     fInputs.push_back().set(v->fType, GrGLShaderVar::kVaryingIn_TypeModifier, v->fFsIn, fsPrec);
 }
+
+void GrGLFragmentBuilder::onBeforeChildProcEmitCode() {
+    fSubstageIndices.back()++;
+    fSubstageIndices.push_back(0);
+    fMangleString.append(this->getMangleStringThisLevel());
+}
+
+void GrGLFragmentBuilder::onAfterChildProcEmitCode() {
+    fSubstageIndices.pop_back();
+    int removeAt = fMangleString.findLastOf('_');
+    fMangleString.remove(removeAt, fMangleString.size() - removeAt);
+}