Cache the inverse matrix on SkColorSpace. Rename xyz() to toXYZ().

tests/SurfaceTest.cpp

Index: tests/SurfaceTest.cpp
diff --git a/tests/SurfaceTest.cpp b/tests/SurfaceTest.cpp
index 58555d37058d7050340704847fa204956337f7db..134076242aecbb8ba666f52a9328933c9935cfff 100644
--- a/tests/SurfaceTest.cpp
+++ b/tests/SurfaceTest.cpp
@@ -921,7 +921,7 @@ static void test_surface_creation_and_snapshot_with_color_space(
 
     auto srgbColorSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
     auto adobeColorSpace = SkColorSpace::NewNamed(SkColorSpace::kAdobeRGB_Named);
-    SkMatrix44 srgbMatrix = srgbColorSpace->xyz();
+    SkMatrix44 srgbMatrix = srgbColorSpace->toXYZ();
     const float oddGamma[] = { 2.4f, 2.4f, 2.4f };
     auto oddColorSpace = SkColorSpace_Base::NewRGB(oddGamma, srgbMatrix);
     auto linearColorSpace = srgbColorSpace->makeLinearGamma();