Add SkColorSpace::Equals() API

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 86 matching lines @@
     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);
 
+    static bool Equals(const SkColorSpace* src, const SkColorSpace* dst);

[reed1, 2016/07/29 22:35:45]

wonder if it should take const& for each, since we don't support null for
either.

[reed1, 2016/08/01 15:08:26]

Perhaps add dox to describe what we do when we see a null (e.g. if one is null
and one is not, we return false, if both are null, we return true, else we do a
deeper compare)

+
 protected:
     SkColorSpace(GammaNamed gammaNamed, const SkMatrix44& toXYZD50, Named named);
 
     const GammaNamed fGammaNamed;
     const SkMatrix44 fToXYZD50;
     const Named      fNamed;
 };
 
 #endif