Introduce GrColorSpaceXform, for gamut conversion on textures

src/gpu/effects/GrSingleTextureEffect.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrSingleTextureEffect_DEFINED
 #define GrSingleTextureEffect_DEFINED
 
@@ skipping 13 matching lines @@
     ~GrSingleTextureEffect() override;
 
     SkString dumpInfo() const override {
         SkString str;
         str.appendf("Texture: %d", fTextureAccess.getTexture()->getUniqueID());
         return str;
     }
 
 protected:
     /** unfiltered, clamp mode */
-    GrSingleTextureEffect(GrTexture*, const SkMatrix&, GrCoordSet = kLocal_GrCoordSet);
+    GrSingleTextureEffect(GrTexture*, sk_sp<GrColorSpaceXform>, const SkMatrix&,
+                          GrCoordSet = kLocal_GrCoordSet);
     /** clamp mode */
-    GrSingleTextureEffect(GrTexture*, const SkMatrix&, GrTextureParams::FilterMode filterMode,
-                          GrCoordSet = kLocal_GrCoordSet);
+    GrSingleTextureEffect(GrTexture*, sk_sp<GrColorSpaceXform>, const SkMatrix&,
+                          GrTextureParams::FilterMode filterMode, GrCoordSet = kLocal_GrCoordSet);
     GrSingleTextureEffect(GrTexture*,
+                          sk_sp<GrColorSpaceXform>,
                           const SkMatrix&,
                           const GrTextureParams&,
                           GrCoordSet = kLocal_GrCoordSet);
 
     /**
      * Can be used as a helper to implement subclass onComputeInvariantOutput(). It assumes that
      * the subclass output color will be a modulation of the input color with a value read from the
      * texture.
      */
     void updateInvariantOutputForModulation(GrInvariantOutput* inout) const {
         if (GrPixelConfigIsAlphaOnly(this->texture(0)->config())) {
             inout->mulByUnknownSingleComponent();
         } else if (GrPixelConfigIsOpaque(this->texture(0)->config())) {
             inout->mulByUnknownOpaqueFourComponents();
         } else {
             inout->mulByUnknownFourComponents();
         }
     }
 
 private:
     GrCoordTransform fCoordTransform;
     GrTextureAccess  fTextureAccess;
 
     typedef GrFragmentProcessor INHERITED;
 };
 
 #endif