Introduce GrColorSpaceXform, for gamut conversion on textures

src/gpu/GrSWMaskHelper.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrSWMaskHelper.h"
 
 #include "GrCaps.h"
@@ skipping 168 matching lines @@
     // matrix to normalized coords.
     SkMatrix maskMatrix;
     maskMatrix.setIDiv(texture->width(), texture->height());
     maskMatrix.preTranslate(SkIntToScalar(-rect.fLeft), SkIntToScalar(-rect.fTop));
 
     GrPipelineBuilder pipelineBuilder(paint, drawContext->mustUseHWAA(paint));
     pipelineBuilder.setUserStencil(userStencilSettings);
 
     pipelineBuilder.addCoverageFragmentProcessor(
                          GrSimpleTextureEffect::Make(texture,
+                                                     nullptr,
                                                      maskMatrix,
                                                      GrTextureParams::kNone_FilterMode,
                                                      kDevice_GrCoordSet));
 
     SkAutoTUnref<GrDrawBatch> batch(GrRectBatchFactory::CreateNonAAFill(paint.getColor(),
                                                                         SkMatrix::I(),
                                                                         dstRect, nullptr, &invert));
     drawContext->drawBatch(pipelineBuilder, clip, batch);
 }