Create GLSLUniformHandler class for gpu backend

src/gpu/effects/GrXfermodeFragmentProcessor.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 "effects/GrXfermodeFragmentProcessor.h"
 
 #include "GrFragmentProcessor.h"
+#include "GrInvariantOutput.h"
 #include "effects/GrConstColorProcessor.h"
 #include "glsl/GrGLSLFragmentProcessor.h"
 #include "glsl/GrGLSLBlend.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
-#include "glsl/GrGLSLProgramBuilder.h"
 #include "SkGrPriv.h"
 
 class ComposeTwoFragmentProcessor : public GrFragmentProcessor {
 public:
     ComposeTwoFragmentProcessor(const GrFragmentProcessor* src, const GrFragmentProcessor* dst,
                     SkXfermode::Mode mode)
         : fMode(mode) {
         this->initClassID<ComposeTwoFragmentProcessor>();
         SkDEBUGCODE(int shaderAChildIndex = )this->registerChildProcessor(src);
         SkDEBUGCODE(int shaderBChildIndex = )this->registerChildProcessor(dst);
@@ skipping 277 matching lines @@
         case SkXfermode::kClear_Mode:
             return GrConstColorProcessor::Create(GrColor_TRANSPARENT_BLACK,
                                                  GrConstColorProcessor::kIgnore_InputMode);
         case SkXfermode::kDst_Mode:
             return nullptr;
         default:
             return new ComposeOneFragmentProcessor(src, mode,
                                                    ComposeOneFragmentProcessor::kSrc_Child);
     }
 }