Introduce GrColorSpaceXform, for gamut conversion on textures

src/gpu/GrBlurUtils.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 "GrBlurUtils.h"
 #include "GrDrawContext.h"
 #include "GrCaps.h"
@@ skipping 17 matching lines @@
 static bool draw_mask(GrDrawContext* drawContext,
                       const GrClip& clip,
                       const SkMatrix& viewMatrix,
                       const SkIRect& maskRect,
                       GrPaint* grp,
                       GrTexture* mask) {
     SkMatrix matrix;
     matrix.setTranslate(-SkIntToScalar(maskRect.fLeft), -SkIntToScalar(maskRect.fTop));
     matrix.postIDiv(mask->width(), mask->height());
 
-    grp->addCoverageFragmentProcessor(GrSimpleTextureEffect::Make(mask, matrix,
+    grp->addCoverageFragmentProcessor(GrSimpleTextureEffect::Make(mask, nullptr, matrix,
                                                                   kDevice_GrCoordSet));
 
     SkMatrix inverse;
     if (!viewMatrix.invert(&inverse)) {
         return false;
     }
     drawContext->fillRectWithLocalMatrix(clip, *grp, SkMatrix::I(),
                                          SkRect::Make(maskRect), inverse);
     return true;
 }
@@ skipping 243 matching lines @@
     }
 
     if (paint.getMaskFilter()) {
         draw_path_with_mask_filter(context, drawContext, clip, &grPaint, viewMatrix,
                                    paint.getMaskFilter(), style,
                                    path, pathIsMutable);
     } else {
         drawContext->drawPath(clip, grPaint, viewMatrix, *path, style);
     }
 }