Add writeToMemory() API to SkColorSpace

include/core/SkColorSpace.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 SkColorSpace_DEFINED
 #define SkColorSpace_DEFINED
 
@@ skipping 65 matching lines @@
     bool gammaCloseToSRGB() const {
         return kSRGB_GammaNamed == fGammaNamed || k2Dot2Curve_GammaNamed == fGammaNamed;
     }
 
     /**
      *  Returns nullptr on failure.  Fails when we fallback to serializing ICC data and
      *  the data is too large to serialize.
      */
     sk_sp<SkData> serialize() const;
 
+    /**
+     *  If |memory| is nullptr, returns the size required to serialize.
+     *  Otherwise, serializes into |memory| and returns the size.
+     */
+    size_t writeToMemory(void* memory) const;
+
     static sk_sp<SkColorSpace> Deserialize(const void* data, size_t length);
 
 protected:
     SkColorSpace(GammaNamed gammaNamed, const SkMatrix44& toXYZD50, Named named);
 
     const GammaNamed fGammaNamed;
     const SkMatrix44 fToXYZD50;
     const Named      fNamed;
 };
 
 #endif