Add the ability to set embedder data on created contexts from the API

include/v8.h

 // Copyright 2007-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2242 matching lines @@
    */
   void Exit();
 
   /** Returns true if the context has experienced an out of memory situation. */
   bool HasOutOfMemoryException();
 
   /** Returns true if V8 has a current context. */
   static bool InContext();
 
   /**
+   * Associate an additional data object with the context. This is mainly used
+   * with the debugger to provide additional information on the context through
+   * the debugger API.
+   */
+  void SetData(Handle<Value> data);
+  Local<Value> GetData();
+
+  /**
    * Stack-allocated class which sets the execution context for all
    * operations executed within a local scope.
    */
   class V8EXPORT Scope {
    public:
     inline Scope(Handle<Context> context) : context_(context) {
       context_->Enter();
     }
     inline ~Scope() { context_->Exit(); }
    private:
@@ skipping 293 matching lines @@
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef V8EXPORT_INLINE
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_