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diff --git a/Source/WebCore/platform/ThreadGlobalData.h b/Source/WebCore/platform/ThreadGlobalData.h
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+/*
+ * Copyright (C) 2008 Apple Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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 with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ *
+ */
+
+#ifndef ThreadGlobalData_h
+#define ThreadGlobalData_h
+
+#include <wtf/HashMap.h>
+#include <wtf/HashSet.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/text/StringHash.h>
+
+#if ENABLE(WORKERS)
+#include <wtf/ThreadSpecific.h>
+#include <wtf/Threading.h>
+using WTF::ThreadSpecific;
+#endif
+
+namespace WebCore {
+
+    class EventNames;
+    struct ICUConverterWrapper;
+    struct TECConverterWrapper;
+    class ThreadTimers;
+
+    class ThreadGlobalData : public Noncopyable {
+    public:
+        ThreadGlobalData();
+        ~ThreadGlobalData();
+        void destroy(); // called on workers to clean up the ThreadGlobalData before the thread exits.
+
+        EventNames& eventNames() { return *m_eventNames; }
+        ThreadTimers& threadTimers() { return *m_threadTimers; }
+
+#if USE(ICU_UNICODE)
+        ICUConverterWrapper& cachedConverterICU() { return *m_cachedConverterICU; }
+#endif
+
+#if PLATFORM(MAC)
+        TECConverterWrapper& cachedConverterTEC() { return *m_cachedConverterTEC; }
+#endif
+
+    private:
+        EventNames* m_eventNames;
+        ThreadTimers* m_threadTimers;
+
+#ifndef NDEBUG
+        bool m_isMainThread;
+#endif
+
+#if USE(ICU_UNICODE)
+        ICUConverterWrapper* m_cachedConverterICU;
+#endif
+
+#if PLATFORM(MAC)
+        TECConverterWrapper* m_cachedConverterTEC;
+#endif
+
+#if ENABLE(WORKERS)
+        static ThreadSpecific<ThreadGlobalData>* staticData;
+#else
+        static ThreadGlobalData* staticData;
+#endif
+        friend ThreadGlobalData& threadGlobalData();
+    };
+
+inline ThreadGlobalData& threadGlobalData() 
+{
+    // FIXME: Workers are not necessarily the only feature that make per-thread global data necessary.
+    // We need to check for e.g. database objects manipulating strings on secondary threads.
+
+#if ENABLE(WORKERS)
+    // ThreadGlobalData is used on main thread before it could possibly be used on secondary ones, so there is no need for synchronization here.
+    if (!ThreadGlobalData::staticData)
+        ThreadGlobalData::staticData = new ThreadSpecific<ThreadGlobalData>;
+    return **ThreadGlobalData::staticData;
+#else
+    if (!ThreadGlobalData::staticData) {
+        ThreadGlobalData::staticData = static_cast<ThreadGlobalData*>(fastMalloc(sizeof(ThreadGlobalData)));
+        // ThreadGlobalData constructor indirectly uses staticData, so we need to set up the memory before invoking it.
+        new (ThreadGlobalData::staticData) ThreadGlobalData;
+    }
+    return *ThreadGlobalData::staticData;
+#endif
+}
+    
+} // namespace WebCore
+
+#endif // ThreadGlobalData_h