Introduce GrColorSpaceXform, for gamut conversion on textures

src/effects/SkPerlinNoiseShader.cpp

Index: src/effects/SkPerlinNoiseShader.cpp
diff --git a/src/effects/SkPerlinNoiseShader.cpp b/src/effects/SkPerlinNoiseShader.cpp
index 2268d4e1d5ed31d904eabd656aa8b0059d920585..975a7129d06848faaf78b251a241c91ac3d22b0a 100644
--- a/src/effects/SkPerlinNoiseShader.cpp
+++ b/src/effects/SkPerlinNoiseShader.cpp
@@ -548,8 +548,8 @@ private:
       : fType(type)
       , fNumOctaves(numOctaves)
       , fStitchTiles(stitchTiles)
-      , fPermutationsAccess(permutationsTexture)
-      , fNoiseAccess(noiseTexture)
+      , fPermutationsAccess(permutationsTexture, nullptr)
+      , fNoiseAccess(noiseTexture, nullptr)
       , fPaintingData(paintingData) {
         this->initClassID<GrPerlinNoiseEffect>();
         this->addTextureAccess(&fPermutationsAccess);