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diff --git a/Source/WebCore/html/parser/HTMLScriptRunner.h b/Source/WebCore/html/parser/HTMLScriptRunner.h
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+++ b/Source/WebCore/html/parser/HTMLScriptRunner.h
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+/*
+ * Copyright (C) 2010 Google, 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 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 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 HTMLScriptRunner_h
+#define HTMLScriptRunner_h
+
+#include "PendingScript.h"
+#include <wtf/Deque.h>
+#include <wtf/text/TextPosition.h>
+#include <wtf/PassRefPtr.h>
+
+namespace WebCore {
+
+class CachedResource;
+class CachedScript;
+class Document;
+class Element;
+class Frame;
+class HTMLScriptRunnerHost;
+class ScriptSourceCode;
+
+class HTMLScriptRunner {
+    WTF_MAKE_NONCOPYABLE(HTMLScriptRunner); WTF_MAKE_FAST_ALLOCATED;
+public:
+    static PassOwnPtr<HTMLScriptRunner> create(Document* document, HTMLScriptRunnerHost* host)
+    {
+        return adoptPtr(new HTMLScriptRunner(document, host));
+    }
+    ~HTMLScriptRunner();
+
+    void detach();
+
+    // Processes the passed in script and any pending scripts if possible.
+    bool execute(PassRefPtr<Element> scriptToProcess, const TextPosition& scriptStartPosition);
+
+    bool executeScriptsWaitingForLoad(CachedResource*);
+    bool hasScriptsWaitingForStylesheets() const { return m_hasScriptsWaitingForStylesheets; }
+    bool executeScriptsWaitingForStylesheets();
+    bool executeScriptsWaitingForParsing();
+
+    bool isExecutingScript() const { return !!m_scriptNestingLevel; }
+
+private:
+    HTMLScriptRunner(Document*, HTMLScriptRunnerHost*);
+
+    Frame* frame() const;
+
+    void executeParsingBlockingScript();
+    void executePendingScriptAndDispatchEvent(PendingScript&);
+    bool haveParsingBlockingScript() const;
+    bool executeParsingBlockingScripts();
+
+    void requestParsingBlockingScript(Element*);
+    void requestDeferredScript(Element*);
+    bool requestPendingScript(PendingScript&, Element*) const;
+
+    void runScript(Element*, const TextPosition& scriptStartPosition);
+
+    // Helpers for dealing with HTMLScriptRunnerHost
+    void watchForLoad(PendingScript&);
+    void stopWatchingForLoad(PendingScript&);
+    bool isPendingScriptReady(const PendingScript&);
+    ScriptSourceCode sourceFromPendingScript(const PendingScript&, bool& errorOccurred) const;
+
+    Document* m_document;
+    HTMLScriptRunnerHost* m_host;
+    PendingScript m_parsingBlockingScript;
+    Deque<PendingScript> m_scriptsToExecuteAfterParsing; // http://www.whatwg.org/specs/web-apps/current-work/#list-of-scripts-that-will-execute-when-the-document-has-finished-parsing
+    unsigned m_scriptNestingLevel;
+
+    // We only want stylesheet loads to trigger script execution if script
+    // execution is currently stopped due to stylesheet loads, otherwise we'd
+    // cause nested script execution when parsing <style> tags since </style>
+    // tags can cause Document to call executeScriptsWaitingForStylesheets.
+    bool m_hasScriptsWaitingForStylesheets;
+};
+
+}
+
+#endif