Refactored SkColorSpace and added in a Lab PCS GM

src/core/SkColorSpace_XYZTRC.h

Index: src/core/SkColorSpace_XYZTRC.h
diff --git a/src/core/SkColorSpace_XYZTRC.h b/src/core/SkColorSpace_XYZTRC.h
new file mode 100644
index 0000000000000000000000000000000000000000..771dc4631511279abd3580066c6b22f9e8e9775b
--- /dev/null
+++ b/src/core/SkColorSpace_XYZTRC.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkColorSpace_XYZTRC_DEFINED
+#define SkColorSpace_XYZTRC_DEFINED
+
+#include "SkColorSpace_Base.h"
+#include "SkData.h"
+#include "SkOnce.h"
+
+class SkColorSpace_XYZTRC : public SkColorSpace_Base {
+public:
+    const SkMatrix44* toXYZD50() const override { return &fToXYZD50; }
+    
+    const SkMatrix44* fromXYZD50() const override;
+
+    bool onGammaCloseToSRGB() const override;
+    
+    bool onGammaIsLinear() const override;
+    
+    sk_sp<SkColorSpace> makeLinearGamma();
+    
+    SkGammaNamed gammaNamed() const { return fGammaNamed; }
+    
+    const SkGammas* gammas() const { return fGammas.get(); }
+
+protected:
+    Type type() const override { return Type::kXYZTRC; }
+
+private:
+    SkColorSpace_XYZTRC(SkGammaNamed gammaNamed, const SkMatrix44& toXYZ);
+
+    SkColorSpace_XYZTRC(SkGammaNamed gammaNamed, sk_sp<SkGammas> gammas,
+                        const SkMatrix44& toXYZ, sk_sp<SkData> profileData);
+
+    const SkGammaNamed        fGammaNamed;
+    sk_sp<SkGammas>           fGammas;
+    const SkMatrix44          fToXYZD50;
+    
+    mutable SkMatrix44        fFromXYZD50;
+    mutable SkOnce            fFromXYZOnce;
+
+    friend class SkColorSpace;
+    friend class SkColorSpace_Base;
+    friend class ColorSpaceXformTest;
+    typedef SkColorSpace_Base INHERITED;
+};
+
+#endif