Introduce GrColorSpaceXform, for gamut conversion on textures

src/gpu/effects/GrBicubicEffect.h

Index: src/gpu/effects/GrBicubicEffect.h
diff --git a/src/gpu/effects/GrBicubicEffect.h b/src/gpu/effects/GrBicubicEffect.h
index 3c84f979191d396fb0430deac717d9c0c674675d..58bb068d5f523c60e337333df529fc86ab75377a 100644
--- a/src/gpu/effects/GrBicubicEffect.h
+++ b/src/gpu/effects/GrBicubicEffect.h
@@ -29,19 +29,23 @@ public:
 
     const GrTextureDomain& domain() const { return fDomain; }
 
+    GrColorSpaceXform* colorSpaceXform() const { return fColorSpaceXform.get(); }
+
     /**
      * Create a simple filter effect with custom bicubic coefficients and optional domain.
      */
-    static sk_sp<GrFragmentProcessor> Make(GrTexture* tex, const SkScalar coefficients[16],
+    static sk_sp<GrFragmentProcessor> Make(GrTexture* tex,
+                                           sk_sp<GrColorSpaceXform> colorSpaceXform,
+                                           const SkScalar coefficients[16],
                                            const SkRect* domain = nullptr) {
         if (nullptr == domain) {
             static const SkShader::TileMode kTileModes[] = { SkShader::kClamp_TileMode,
                                                              SkShader::kClamp_TileMode };
-            return Make(tex, coefficients, GrCoordTransform::MakeDivByTextureWHMatrix(tex),
-                        kTileModes);
+            return Make(tex, std::move(colorSpaceXform), coefficients,
+                        GrCoordTransform::MakeDivByTextureWHMatrix(tex), kTileModes);
         } else {
             return sk_sp<GrFragmentProcessor>(
-                new GrBicubicEffect(tex, coefficients,
+                new GrBicubicEffect(tex, std::move(colorSpaceXform), coefficients,
                                     GrCoordTransform::MakeDivByTextureWHMatrix(tex), *domain));
         }
     }
@@ -49,28 +53,35 @@ public:
     /**
      * Create a Mitchell filter effect with specified texture matrix and x/y tile modes.
      */
-    static sk_sp<GrFragmentProcessor> Make(GrTexture* tex, const SkMatrix& matrix,
+    static sk_sp<GrFragmentProcessor> Make(GrTexture* tex,
+                                           sk_sp<GrColorSpaceXform> colorSpaceXform,
+                                           const SkMatrix& matrix,
                                            const SkShader::TileMode tileModes[2]) {
-        return Make(tex, gMitchellCoefficients, matrix, tileModes);
+        return Make(tex, std::move(colorSpaceXform), gMitchellCoefficients, matrix, tileModes);
     }
 
     /**
      * Create a filter effect with custom bicubic coefficients, the texture matrix, and the x/y
      * tilemodes.
      */
-    static sk_sp<GrFragmentProcessor> Make(GrTexture* tex, const SkScalar coefficients[16],
+    static sk_sp<GrFragmentProcessor> Make(GrTexture* tex,
+                                           sk_sp<GrColorSpaceXform> colorSpaceXform, 
+                                           const SkScalar coefficients[16],
                                            const SkMatrix& matrix,
                                            const SkShader::TileMode tileModes[2]) {
-        return sk_sp<GrFragmentProcessor>(new GrBicubicEffect(tex, coefficients, matrix,
-                                                              tileModes));
+        return sk_sp<GrFragmentProcessor>(new GrBicubicEffect(tex, std::move(colorSpaceXform),
+                                                              coefficients, matrix, tileModes));
     }
 
     /**
      * Create a Mitchell filter effect with a texture matrix and a domain.
      */
-    static sk_sp<GrFragmentProcessor> Make(GrTexture* tex, const SkMatrix& matrix,
+    static sk_sp<GrFragmentProcessor> Make(GrTexture* tex,
+                                           sk_sp<GrColorSpaceXform> colorSpaceXform,
+                                           const SkMatrix& matrix,
                                            const SkRect& domain) {
-        return sk_sp<GrFragmentProcessor>(new GrBicubicEffect(tex, gMitchellCoefficients, matrix,
+        return sk_sp<GrFragmentProcessor>(new GrBicubicEffect(tex, std::move(colorSpaceXform),
+                                                              gMitchellCoefficients, matrix,
                                                               domain));
     }
 
@@ -85,10 +96,10 @@ public:
                                  GrTextureParams::FilterMode* filterMode);
 
 private:
-    GrBicubicEffect(GrTexture*, const SkScalar coefficients[16], const SkMatrix &matrix,
-                    const SkShader::TileMode tileModes[2]);
-    GrBicubicEffect(GrTexture*, const SkScalar coefficients[16], const SkMatrix &matrix,
-                    const SkRect& domain);
+    GrBicubicEffect(GrTexture*, sk_sp<GrColorSpaceXform>, const SkScalar coefficients[16],
+                    const SkMatrix &matrix, const SkShader::TileMode tileModes[2]);
+    GrBicubicEffect(GrTexture*, sk_sp<GrColorSpaceXform>, const SkScalar coefficients[16],
+                    const SkMatrix &matrix, const SkRect& domain);
 
     GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
 
@@ -100,6 +111,7 @@ private:
 
     float           fCoefficients[16];
     GrTextureDomain fDomain;
+    sk_sp<GrColorSpaceXform> fColorSpaceXform;
 
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;