Introduce GrColorSpaceXform, for gamut conversion on textures

src/gpu/GrPipelineBuilder.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrPipelineBuilder_DEFINED
 #define GrPipelineBuilder_DEFINED
 
@@ skipping 59 matching lines @@
 
     void addCoverageFragmentProcessor(sk_sp<GrFragmentProcessor> processor) {
         SkASSERT(processor);
         fCoverageFragmentProcessors.push_back(std::move(processor));
     }
 
     /**
      * Creates a GrSimpleTextureEffect that uses local coords as texture coordinates.
      */
     void addColorTextureProcessor(GrTexture* texture, const SkMatrix& matrix) {
-        this->addColorFragmentProcessor(GrSimpleTextureEffect::Make(texture, matrix));
+        this->addColorFragmentProcessor(GrSimpleTextureEffect::Make(texture, nullptr, matrix));
     }
 
     void addCoverageTextureProcessor(GrTexture* texture, const SkMatrix& matrix) {
-        this->addCoverageFragmentProcessor(GrSimpleTextureEffect::Make(texture, matrix));
+        this->addCoverageFragmentProcessor(GrSimpleTextureEffect::Make(texture, nullptr, matrix));
     }
 
     void addColorTextureProcessor(GrTexture* texture,
                                   const SkMatrix& matrix,
                                   const GrTextureParams& params) {
-        this->addColorFragmentProcessor(GrSimpleTextureEffect::Make(texture, matrix, params));
+        this->addColorFragmentProcessor(GrSimpleTextureEffect::Make(texture, nullptr, matrix,
+                                                                    params));
     }
 
     void addCoverageTextureProcessor(GrTexture* texture,
                                      const SkMatrix& matrix,
                                      const GrTextureParams& params) {
-        this->addCoverageFragmentProcessor(GrSimpleTextureEffect::Make(texture, matrix, params));
+        this->addCoverageFragmentProcessor(GrSimpleTextureEffect::Make(texture, nullptr, matrix,
+                                                                       params));
     }
 
     /**
      * When this object is destroyed it will remove any color/coverage FPs from the pipeline builder
      * that were added after its constructor.
      * This class can transiently modify its "const" GrPipelineBuilder object but will restore it
      * when done - so it is notionally "const" correct.
      */
     class AutoRestoreFragmentProcessorState : public ::SkNoncopyable {
     public:
@@ skipping 199 matching lines @@
     DrawFace                                fDrawFace;
     mutable sk_sp<GrXPFactory>              fXPFactory;
     FragmentProcessorArray                  fColorFragmentProcessors;
     FragmentProcessorArray                  fCoverageFragmentProcessors;
 
     friend class GrPipeline;
     friend class GrDrawTarget;
 };
 
 #endif