Introduce GrColorSpaceXform, for gamut conversion on textures

src/effects/SkBlurMaskFilter.cpp

Index: src/effects/SkBlurMaskFilter.cpp
diff --git a/src/effects/SkBlurMaskFilter.cpp b/src/effects/SkBlurMaskFilter.cpp
index 6a20d48c758cd1f64f5fe4ab38d2fca93bece2be..b28357db927bcded50aa7064866e4da77a81adc3 100644
--- a/src/effects/SkBlurMaskFilter.cpp
+++ b/src/effects/SkBlurMaskFilter.cpp
@@ -813,7 +813,7 @@ GrRectBlurEffect::GrRectBlurEffect(const SkRect& rect, float sigma, GrTexture *b
                                    GrSLPrecision precision)
     : fRect(rect)
     , fSigma(sigma)
-    , fBlurProfileAccess(blurProfile)
+    , fBlurProfileAccess(blurProfile, nullptr)
     , fPrecision(precision) {
     this->initClassID<GrRectBlurEffect>();
     this->addTextureAccess(&fBlurProfileAccess);
@@ -1023,7 +1023,7 @@ void GrRRectBlurEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const
 GrRRectBlurEffect::GrRRectBlurEffect(float sigma, const SkRRect& rrect, GrTexture *ninePatchTexture)
     : fRRect(rrect),
       fSigma(sigma),
-      fNinePatchAccess(ninePatchTexture) {
+      fNinePatchAccess(ninePatchTexture, nullptr) {
     this->initClassID<GrRRectBlurEffect>();
     this->addTextureAccess(&fNinePatchAccess);
     this->setWillReadFragmentPosition();
@@ -1260,7 +1260,7 @@ bool SkBlurMaskFilterImpl::filterMaskGPU(GrTexture* src,
         SkMatrix matrix;
         matrix.setIDiv(src->width(), src->height());
         // Blend pathTexture over blurTexture.
-        paint.addCoverageFragmentProcessor(GrSimpleTextureEffect::Make(src, matrix));
+        paint.addCoverageFragmentProcessor(GrSimpleTextureEffect::Make(src, nullptr, matrix));
         if (kInner_SkBlurStyle == fBlurStyle) {
             // inner:  dst = dst * src
             paint.setCoverageSetOpXPFactory(SkRegion::kIntersect_Op);