ES6: Add support for Map.prototype.forEach and Set.prototype.forEach

src/factory.h

 // Copyright 2014 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.
 
 #ifndef V8_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "isolate.h"
 
 namespace v8 {
@@ skipping 575 matching lines @@
                              int capture_count);
 
   // Returns the value for a known global constant (a property of the global
   // object which is neither configurable nor writable) like 'undefined'.
   // Returns a null handle when the given name is unknown.
   Handle<Object> GlobalConstantFor(Handle<String> name);
 
   // Converts the given boolean condition to JavaScript boolean value.
   Handle<Object> ToBoolean(bool value);
 
+  Handle<JSObject> CreateIteratorResultObject(Handle<Object> value, bool done);
+
  private:
   Isolate* isolate() { return reinterpret_cast<Isolate*>(this); }
 
   Handle<JSFunction> NewFunctionHelper(Handle<String> name,
                                        Handle<Object> prototype);
 
   Handle<JSFunction> NewFunctionWithoutPrototypeHelper(
       Handle<String> name,
       StrictMode strict_mode);
 
   // Create a new map cache.
   Handle<MapCache> NewMapCache(int at_least_space_for);
 
   // Update the map cache in the native context with (keys, map)
   Handle<MapCache> AddToMapCache(Handle<Context> context,
                                  Handle<FixedArray> keys,
                                  Handle<Map> map);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_FACTORY_H_