SkValue: to/from SkImage

src/core/SkValueKeys.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 SkValueKeys_DEFINED
 #define SkValueKeys_DEFINED
 
 namespace SkValueKeys {
+    namespace Image { enum { kEncoded, kUniqueID }; }
     namespace ArithmeticXfermode {
         enum { kK0, kK1, kK2, kK3, kEnforcePMColor };
     }
     namespace LerpXfermode { enum { kScale }; }
     namespace PixelXorXfermode { enum { kOpColor }; }
     namespace ProcCoeffXfermode { enum { kMode }; }
 }
 
 #endif  // SkValueKeys_DEFINED