Gamut transformation of the paint color in Ganesh

src/gpu/GrColorSpaceXform.cpp

Index: src/gpu/GrColorSpaceXform.cpp
diff --git a/src/gpu/GrColorSpaceXform.cpp b/src/gpu/GrColorSpaceXform.cpp
index 2d17610bdad23c8d231339889a58ee674aeb7e6a..3380b0f39079a7e3b4eef68aa2b4dba10a8334c0 100644
--- a/src/gpu/GrColorSpaceXform.cpp
+++ b/src/gpu/GrColorSpaceXform.cpp
@@ -58,3 +58,9 @@ sk_sp<GrColorSpaceXform> GrColorSpaceXform::Make(SkColorSpace* src, SkColorSpace
 
     return sk_make_sp<GrColorSpaceXform>(srcToDst);
 }
+
+GrColor4f GrColorSpaceXform::apply(const GrColor4f& srcColor) {
+    GrColor4f result;
+    fSrcToDst.mapScalars(srcColor.fRGBA, result.fRGBA);
+    return result;
+}