Introduce GrColorSpaceXform, for gamut conversion on textures

include/gpu/GrPaint.h

Index: include/gpu/GrPaint.h
diff --git a/include/gpu/GrPaint.h b/include/gpu/GrPaint.h
index 70067ae4491b418f4dfec03c17eafb313d05ee46..5457004ba63b686d1f929e0f8afa5c636818bbb3 100644
--- a/include/gpu/GrPaint.h
+++ b/include/gpu/GrPaint.h
@@ -115,9 +115,10 @@ public:
      * Helpers for adding color or coverage effects that sample a texture. The matrix is applied
      * to the src space position to compute texture coordinates.
      */
-    void addColorTextureProcessor(GrTexture*, const SkMatrix&);
+    void addColorTextureProcessor(GrTexture*, sk_sp<GrColorSpaceXform>, const SkMatrix&);
     void addCoverageTextureProcessor(GrTexture*, const SkMatrix&);
-    void addColorTextureProcessor(GrTexture*, const SkMatrix&, const GrTextureParams&);
+    void addColorTextureProcessor(GrTexture*, sk_sp<GrColorSpaceXform>, const SkMatrix&,
+                                  const GrTextureParams&);
     void addCoverageTextureProcessor(GrTexture*, const SkMatrix&, const GrTextureParams&);
 
     int numColorFragmentProcessors() const { return fColorFragmentProcessors.count(); }