Expose well-known Symbols to C++ API.

include/v8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
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   // Note that symbols created this way are never collected, so
   // they should only be used for statically fixed properties.
   // Also, there is only one global name space for the names used as keys.
   // To minimize the potential for clashes, use qualified names as keys.
   static Local<Symbol> For(Isolate *isolate, Local<String> name);
 
   // Retrieve a global symbol. Similar to |For|, but using a separate
   // registry that is not accessible by (and cannot clash with) JavaScript code.
   static Local<Symbol> ForApi(Isolate *isolate, Local<String> name);
 
+  // Well-known symbols
+  static Local<Symbol> GetIterator(Isolate* isolate);
+  static Local<Symbol> GetUnscopables(Isolate* isolate);
+
   V8_INLINE static Symbol* Cast(v8::Value* obj);
+
  private:
   Symbol();
   static void CheckCast(v8::Value* obj);
 };
 
 
 /**
  * A private symbol
  *
  * This is an experimental feature. Use at your own risk.
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  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_