Add GetIdentityHash to v8::Name object 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.
@@ skipping 1804 matching lines @@
   bool Value() const;
   V8_INLINE static Handle<Boolean> New(Isolate* isolate, bool value);
 };
 
 
 /**
  * A superclass for symbols and strings.
  */
 class V8_EXPORT Name : public Primitive {
  public:
+  /**
+   * Returns the identity hash for this object. The current implementation
+   * uses an inline property on the object to store the identity hash.
+   *
+   * The return value will never be 0. Also, it is not guaranteed to be
+   * unique.
+   */
+  int GetIdentityHash();
+
   V8_INLINE static Name* Cast(v8::Value* obj);
  private:
   static void CheckCast(v8::Value* obj);
 };
 
 
 /**
  * A JavaScript string value (ECMA-262, 4.3.17).
  */
 class V8_EXPORT String : public Name {
@@ skipping 5624 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_