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diff --git a/Source/WebCore/dom/ScriptExecutionContext.h b/Source/WebCore/dom/ScriptExecutionContext.h
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+++ b/Source/WebCore/dom/ScriptExecutionContext.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 ScriptExecutionContext_h
+#define ScriptExecutionContext_h
+
+#include "ActiveDOMObject.h"
+#include "ConsoleTypes.h"
+#include "KURL.h"
+#include "SecurityContext.h"
+#include <wtf/Forward.h>
+#include <wtf/HashMap.h>
+#include <wtf/HashSet.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/OwnPtr.h>
+#include <wtf/PassOwnPtr.h>
+#include <wtf/Threading.h>
+#include <wtf/text/StringHash.h>
+
+#if USE(JSC)
+#include <runtime/JSGlobalData.h>
+#endif
+
+namespace WebCore {
+
+class DOMTimer;
+class EventListener;
+class EventQueue;
+class EventTarget;
+class MessagePort;
+class ScriptCallStack;
+
+#if ENABLE(SQL_DATABASE)
+class Database;
+class DatabaseTaskSynchronizer;
+class DatabaseThread;
+#endif
+
+#if ENABLE(BLOB) || ENABLE(FILE_SYSTEM)
+class FileThread;
+#endif
+
+class ScriptExecutionContext : public SecurityContext {
+public:
+    ScriptExecutionContext();
+    virtual ~ScriptExecutionContext();
+
+    virtual bool isDocument() const { return false; }
+    virtual bool isWorkerContext() const { return false; }
+
+#if ENABLE(SQL_DATABASE)
+    virtual bool allowDatabaseAccess() const = 0;
+    virtual void databaseExceededQuota(const String& name) = 0;
+    DatabaseThread* databaseThread();
+    void setHasOpenDatabases() { m_hasOpenDatabases = true; }
+    bool hasOpenDatabases() const { return m_hasOpenDatabases; }
+    // When the database cleanup is done, cleanupSync will be signalled.
+    void stopDatabases(DatabaseTaskSynchronizer*);
+#endif
+    virtual bool isContextThread() const = 0;
+    virtual bool isJSExecutionForbidden() const = 0;
+
+    const KURL& url() const { return virtualURL(); }
+    KURL completeURL(const String& url) const { return virtualCompleteURL(url); }
+
+    virtual String userAgent(const KURL&) const = 0;
+
+    virtual void disableEval() = 0;
+
+    bool sanitizeScriptError(String& errorMessage, int& lineNumber, String& sourceURL);
+    void reportException(const String& errorMessage, int lineNumber, const String& sourceURL, PassRefPtr<ScriptCallStack>);
+    virtual void addMessage(MessageSource, MessageType, MessageLevel, const String& message, unsigned lineNumber, const String& sourceURL, PassRefPtr<ScriptCallStack>) = 0;
+    void addConsoleMessage(MessageSource, MessageType, MessageLevel, const String& message);
+
+    // Active objects are not garbage collected even if inaccessible, e.g. because their activity may result in callbacks being invoked.
+    bool canSuspendActiveDOMObjects();
+    // Active objects can be asked to suspend even if canSuspendActiveDOMObjects() returns 'false' -
+    // step-by-step JS debugging is one example.
+    virtual void suspendActiveDOMObjects(ActiveDOMObject::ReasonForSuspension);
+    virtual void resumeActiveDOMObjects();
+    virtual void stopActiveDOMObjects();
+
+    void didCreateActiveDOMObject(ActiveDOMObject*, void* upcastPointer);
+    void willDestroyActiveDOMObject(ActiveDOMObject*);
+
+    typedef const HashMap<ActiveDOMObject*, void*> ActiveDOMObjectsMap;
+    ActiveDOMObjectsMap& activeDOMObjects() const { return m_activeDOMObjects; }
+
+    void didCreateDestructionObserver(ContextDestructionObserver*);
+    void willDestroyDestructionObserver(ContextDestructionObserver*);
+
+    virtual void suspendScriptedAnimationControllerCallbacks() { }
+    virtual void resumeScriptedAnimationControllerCallbacks() { }
+
+    // MessagePort is conceptually a kind of ActiveDOMObject, but it needs to be tracked separately for message dispatch.
+    void processMessagePortMessagesSoon();
+    void dispatchMessagePortEvents();
+    void createdMessagePort(MessagePort*);
+    void destroyedMessagePort(MessagePort*);
+    const HashSet<MessagePort*>& messagePorts() const { return m_messagePorts; }
+
+    void ref() { refScriptExecutionContext(); }
+    void deref() { derefScriptExecutionContext(); }
+
+    class Task {
+        WTF_MAKE_NONCOPYABLE(Task);
+        WTF_MAKE_FAST_ALLOCATED;
+    public:
+        Task() { }
+        virtual ~Task();
+        virtual void performTask(ScriptExecutionContext*) = 0;
+        // Certain tasks get marked specially so that they aren't discarded, and are executed, when the context is shutting down its message queue.
+        virtual bool isCleanupTask() const { return false; }
+    };
+
+    virtual void postTask(PassOwnPtr<Task>) = 0; // Executes the task on context's thread asynchronously.
+
+    void addTimeout(int timeoutId, DOMTimer*);
+    void removeTimeout(int timeoutId);
+    DOMTimer* findTimeout(int timeoutId);
+
+#if USE(JSC)
+    JSC::JSGlobalData* globalData();
+#endif
+
+#if ENABLE(BLOB) || ENABLE(FILE_SYSTEM)
+    FileThread* fileThread();
+    void stopFileThread();
+#endif
+
+    // Interval is in seconds.
+    void adjustMinimumTimerInterval(double oldMinimumTimerInterval);
+    virtual double minimumTimerInterval() const;
+
+    virtual EventQueue* eventQueue() const = 0;
+
+protected:
+    class AddConsoleMessageTask : public Task {
+    public:
+        static PassOwnPtr<AddConsoleMessageTask> create(MessageSource source, MessageType type, MessageLevel level, const String& message)
+        {
+            return adoptPtr(new AddConsoleMessageTask(source, type, level, message));
+        }
+        virtual void performTask(ScriptExecutionContext*);
+    private:
+        AddConsoleMessageTask(MessageSource source, MessageType type, MessageLevel level, const String& message)
+            : m_source(source)
+            , m_type(type)
+            , m_level(level)
+            , m_message(message.isolatedCopy())
+        {
+        }
+        MessageSource m_source;
+        MessageType m_type;
+        MessageLevel m_level;
+        String m_message;
+    };
+
+private:
+    virtual const KURL& virtualURL() const = 0;
+    virtual KURL virtualCompleteURL(const String&) const = 0;
+
+    virtual EventTarget* errorEventTarget() = 0;
+    virtual void logExceptionToConsole(const String& errorMessage, int lineNumber, const String& sourceURL, PassRefPtr<ScriptCallStack>) = 0;
+    bool dispatchErrorEvent(const String& errorMessage, int lineNumber, const String& sourceURL);
+
+    void closeMessagePorts();
+
+    HashSet<MessagePort*> m_messagePorts;
+    HashSet<ContextDestructionObserver*> m_destructionObservers;
+    HashMap<ActiveDOMObject*, void*> m_activeDOMObjects;
+    bool m_iteratingActiveDOMObjects;
+    bool m_inDestructor;
+
+    typedef HashMap<int, DOMTimer*> TimeoutMap;
+    TimeoutMap m_timeouts;
+
+    virtual void refScriptExecutionContext() = 0;
+    virtual void derefScriptExecutionContext() = 0;
+
+    bool m_inDispatchErrorEvent;
+    class PendingException;
+    OwnPtr<Vector<OwnPtr<PendingException> > > m_pendingExceptions;
+
+#if ENABLE(SQL_DATABASE)
+    RefPtr<DatabaseThread> m_databaseThread;
+    bool m_hasOpenDatabases; // This never changes back to false, even after the database thread is closed.
+#endif
+
+#if ENABLE(BLOB) || ENABLE(FILE_SYSTEM)
+    RefPtr<FileThread> m_fileThread;
+#endif
+};
+
+} // namespace WebCore
+
+#endif // ScriptExecutionContext_h