Add ability to add general layout qualifiers GrGLSLShaderVar

src/gpu/glsl/GrGLSLFragmentShaderBuilder.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 "GrGLSLFragmentShaderBuilder.h"
 #include "GrRenderTarget.h"
 #include "glsl/GrGLSL.h"
@@ skipping 111 matching lines @@
     } else if (const char* extension = glslCaps->fragCoordConventionsExtensionString()) {
         if (!fSetupFragPosition) {
             if (glslCaps->generation() < k150_GrGLSLGeneration) {
                 this->addFeature(1 << kFragCoordConventions_GLSLPrivateFeature,
                                  extension);
             }
             fInputs.push_back().set(kVec4f_GrSLType,
                                     GrGLSLShaderVar::kIn_TypeModifier,
                                     "gl_FragCoord",
                                     kDefault_GrSLPrecision,
-                                    GrGLSLShaderVar::kUpperLeft_Origin);
+                                    "origin_upper_left");
             fSetupFragPosition = true;
         }
         return "gl_FragCoord";
     } else {
         static const char* kTempName = "tmpXYFragCoord";
         static const char* kCoordName = "fragCoordYDown";
         if (!fSetupFragPosition) {
             const char* rtHeightName;
 
             fProgramBuilder->addRTHeightUniform("RTHeight", &rtHeightName);
@@ skipping 106 matching lines @@
 }
 
 void GrGLSLFragmentBuilder::onAfterChildProcEmitCode() {
     SkASSERT(fSubstageIndices.count() >= 2);
     fSubstageIndices.pop_back();
     fSubstageIndices.back()++;
     int removeAt = fMangleString.findLastOf('_');
     fMangleString.remove(removeAt, fMangleString.size() - removeAt);
 }