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diff --git a/Tools/DumpRenderTree/WorkQueueItem.h b/Tools/DumpRenderTree/WorkQueueItem.h
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+/*
+ * Copyright (C) 2007, 2009 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. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 WorkQueueItem_h
+#define WorkQueueItem_h
+
+#include <JavaScriptCore/JSRetainPtr.h>
+#include <JavaScriptCore/JSBase.h>
+
+class WorkQueueItem {
+public:
+    virtual ~WorkQueueItem() { }
+    virtual bool invoke() const = 0; // Returns true if this started a load.
+};
+
+class LoadItem : public WorkQueueItem {
+public:
+    LoadItem(const JSStringRef url, const JSStringRef target)
+        : m_url(url)
+        , m_target(target)
+    {
+    }
+
+private:
+    virtual bool invoke() const;
+
+    JSRetainPtr<JSStringRef> m_url;
+    JSRetainPtr<JSStringRef> m_target;
+};
+
+class LoadHTMLStringItem : public WorkQueueItem {
+public:
+    LoadHTMLStringItem(const JSStringRef content, const JSStringRef baseURL)
+        : m_content(content)
+        , m_baseURL(baseURL)
+    {
+    }
+
+private:
+    virtual bool invoke() const;
+
+    JSRetainPtr<JSStringRef> m_content;
+    JSRetainPtr<JSStringRef> m_baseURL;
+};
+
+class ReloadItem : public WorkQueueItem {
+private:
+    virtual bool invoke() const;
+};
+
+class ScriptItem : public WorkQueueItem {
+protected:
+    ScriptItem(const JSStringRef script)
+        : m_script(script)
+    {
+    }
+
+protected:
+    virtual bool invoke() const;
+
+private:
+    JSRetainPtr<JSStringRef> m_script;
+};
+
+class LoadingScriptItem : public ScriptItem {
+public:
+    LoadingScriptItem(const JSStringRef script)
+        : ScriptItem(script)
+    {
+    }
+
+private:
+    virtual bool invoke() const { return ScriptItem::invoke(); }
+};
+
+class NonLoadingScriptItem : public ScriptItem {
+public:
+    NonLoadingScriptItem(const JSStringRef script)
+        : ScriptItem(script)
+    {
+    }
+
+private:
+    virtual bool invoke() const { ScriptItem::invoke(); return false; }
+};
+
+class BackForwardItem : public WorkQueueItem {
+protected:
+    BackForwardItem(int howFar)
+        : m_howFar(howFar)
+    {
+    }
+
+private:
+    virtual bool invoke() const;
+
+    int m_howFar;
+};
+
+class BackItem : public BackForwardItem {
+public:
+    BackItem(unsigned howFar)
+        : BackForwardItem(-howFar)
+    {
+    }
+};
+
+class ForwardItem : public BackForwardItem {
+public:
+    ForwardItem(unsigned howFar)
+        : BackForwardItem(howFar)
+    {
+    }
+};
+
+#endif // !defined(WorkQueueItem_h)