Refactored SkColorSpace and added in a Lab PCS GM

tests/SurfaceTest.cpp

Index: tests/SurfaceTest.cpp
diff --git a/tests/SurfaceTest.cpp b/tests/SurfaceTest.cpp
index 241ddb1dbc6257356dc4f7c088c0f45cbf717804..180f2d985b6060e1bf9eee57e3ca6ac86447e5e7 100644
--- a/tests/SurfaceTest.cpp
+++ b/tests/SurfaceTest.cpp
@@ -921,9 +921,10 @@ 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 = as_CSB(srgbColorSpace)->toXYZD50();
+    const SkMatrix44* srgbMatrix = as_CSB(srgbColorSpace)->toXYZD50();
+    SkASSERT(srgbMatrix);
     const float oddGamma[] = { 2.4f, 2.4f, 2.4f };
-    auto oddColorSpace = SkColorSpace::NewRGB(oddGamma, srgbMatrix);
+    auto oddColorSpace = SkColorSpace::NewRGB(oddGamma, *srgbMatrix);
     auto linearColorSpace = SkColorSpace::NewNamed(SkColorSpace::kSRGBLinear_Named);
 
     const struct {