ES6: Add support for Map/Set 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 480 matching lines @@
   Handle<Object> NewSyntaxError(Handle<String> message);
 
   Handle<Object> NewReferenceError(const char* message,
                                    Vector< Handle<Object> > args);
   Handle<Object> NewReferenceError(const char* message, Handle<JSArray> args);
   Handle<Object> NewReferenceError(Handle<String> message);
 
   Handle<Object> NewEvalError(const char* message,
                               Vector< Handle<Object> > args);
 
+  Handle<JSObject> NewIteratorResultObject(Handle<Object> value, bool done);
+
   Handle<String> NumberToString(Handle<Object> number,
                                 bool check_number_string_cache = true);
   Handle<String> Uint32ToString(uint32_t value);
 
   enum ApiInstanceType {
     JavaScriptObject,
     InnerGlobalObject,
     OuterGlobalObject
   };
 
@@ skipping 132 matching lines @@
 
   // 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_