Make SkColorSpace a public API

src/core/SkColorSpace_Base.h

 /*
  * 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 SkColorSpacePriv_DEFINED
-#define SkColorSpacePriv_DEFINED
+#ifndef SkColorSpace_Base_DEFINED
+#define SkColorSpace_Base_DEFINED
+
+#include "SkColorSpace.h"
 
 struct SkGammaCurve {
     bool isValue() const {
         bool result = (0.0f != fValue);
         SkASSERT(!result || (0 == fTableSize));
         return result;
     }
 
     bool isTable() const {
         bool result = (0 != fTableSize);
@@ skipping 59 matching lines @@
     uint8_t                  fInputChannels;
     uint8_t                  fOutputChannels;
     uint8_t                  fGridPoints[kMaxChannels];
     std::unique_ptr<float[]> fTable;
 
     SkColorLookUpTable() {
         memset(this, 0, sizeof(struct SkColorLookUpTable));
     }
 };
 
+class SkColorSpace_Base : public SkColorSpace {
+public:
+
+    SkGammas* gammas() const { return fGammas.get(); }
+
+private:
+
+    SkColorSpace_Base(sk_sp<SkGammas> gammas, const SkMatrix44& toXYZ, Named);
+
+    SkColorSpace_Base(sk_sp<SkGammas> gammas, GammaNamed gammaNamed, const SkMatrix44& toXYZ,
+                      Named);
+
+    SkColorSpace_Base(SkColorLookUpTable* colorLUT, sk_sp<SkGammas> gammas,
+                      const SkMatrix44& toXYZ);
+
+    SkAutoTDelete<SkColorLookUpTable> fColorLUT;
+    sk_sp<SkGammas>                   fGammas;
+
+    friend class SkColorSpace;
+    typedef SkColorSpace INHERITED;
+};
+
+static inline SkColorSpace_Base* as_CSB(SkColorSpace* colorSpace) {
+    return static_cast<SkColorSpace_Base*>(colorSpace);
+}
+
 #endif