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diff --git a/Source/WebCore/bindings/js/DOMWrapperWorld.cpp b/Source/WebCore/bindings/js/DOMWrapperWorld.cpp
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+++ b/Source/WebCore/bindings/js/DOMWrapperWorld.cpp
@@ -0,0 +1,82 @@
+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+#include "DOMWrapperWorld.h"
+
+#include "JSDOMWindow.h"
+#include "ScriptController.h"
+#include "WebCoreJSClientData.h"
+
+using namespace JSC;
+
+namespace WebCore {
+
+DOMWrapperWorld::DOMWrapperWorld(JSC::JSGlobalData* globalData, bool isNormal)
+    : m_globalData(globalData)
+    , m_isNormal(isNormal)
+{
+    JSGlobalData::ClientData* clientData = m_globalData->clientData;
+    ASSERT(clientData);
+    static_cast<WebCoreJSClientData*>(clientData)->rememberWorld(this);
+}
+
+DOMWrapperWorld::~DOMWrapperWorld()
+{
+    JSGlobalData::ClientData* clientData = m_globalData->clientData;
+    ASSERT(clientData);
+    static_cast<WebCoreJSClientData*>(clientData)->forgetWorld(this);
+
+    // These items are created lazily.
+    while (!m_documentsWithWrapperCaches.isEmpty())
+        (*m_documentsWithWrapperCaches.begin())->destroyWrapperCache(this);
+
+    while (!m_scriptControllersWithWindowShells.isEmpty())
+        (*m_scriptControllersWithWindowShells.begin())->destroyWindowShell(this);
+}
+
+void DOMWrapperWorld::clearWrappers()
+{
+    m_wrappers.clear();
+    m_stringCache.clear();
+
+    // These items are created lazily.
+    while (!m_documentsWithWrapperCaches.isEmpty())
+        (*m_documentsWithWrapperCaches.begin())->destroyWrapperCache(this);
+
+    while (!m_scriptControllersWithWindowShells.isEmpty())
+        (*m_scriptControllersWithWindowShells.begin())->destroyWindowShell(this);
+}
+
+DOMWrapperWorld* normalWorld(JSC::JSGlobalData& globalData)
+{
+    JSGlobalData::ClientData* clientData = globalData.clientData;
+    ASSERT(clientData);
+    return static_cast<WebCoreJSClientData*>(clientData)->normalWorld();
+}
+
+DOMWrapperWorld* mainThreadNormalWorld()
+{
+    ASSERT(isMainThread());
+    static DOMWrapperWorld* cachedNormalWorld = normalWorld(*JSDOMWindow::commonJSGlobalData());
+    return cachedNormalWorld;
+}
+
+} // namespace WebCore