Introduce GrColorSpaceXform, for gamut conversion on textures

src/gpu/effects/GrSimpleTextureEffect.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 "GrSimpleTextureEffect.h"
 #include "GrInvariantOutput.h"
 #include "GrTexture.h"
@@ skipping 50 matching lines @@
     GrTextureParams params(tileModes, d->fRandom->nextBool() ? GrTextureParams::kBilerp_FilterMode :
                                                                GrTextureParams::kNone_FilterMode);
 
     static const GrCoordSet kCoordSets[] = {
         kLocal_GrCoordSet,
         kDevice_GrCoordSet
     };
     GrCoordSet coordSet = kCoordSets[d->fRandom->nextULessThan(SK_ARRAY_COUNT(kCoordSets))];
 
     const SkMatrix& matrix = GrTest::TestMatrix(d->fRandom);
-    return GrSimpleTextureEffect::Make(d->fTextures[texIdx], matrix, coordSet);
+    return GrSimpleTextureEffect::Make(d->fTextures[texIdx], nullptr, matrix, coordSet);
 }