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diff --git a/WebCore/fileapi/DOMFileSystem.h b/WebCore/fileapi/DOMFileSystem.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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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 DOMFileSystem_h
+#define DOMFileSystem_h
+
+#if ENABLE(FILE_SYSTEM)
+
+#include "ActiveDOMObject.h"
+#include "AsyncFileSystem.h"
+#include "Flags.h"
+#include "PlatformString.h"
+#include "ScriptExecutionContext.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+
+class DirectoryEntry;
+class Entry;
+class EntryCallback;
+class EntriesCallback;
+class ErrorCallback;
+class MetadataCallback;
+class VoidCallback;
+
+class DOMFileSystem : public RefCounted<DOMFileSystem>, public ActiveDOMObject {
+public:
+    static PassRefPtr<DOMFileSystem> create(ScriptExecutionContext* context, const String& name, PassOwnPtr<AsyncFileSystem> asyncFileSystem)
+    {
+        return adoptRef(new DOMFileSystem(context, name, asyncFileSystem));
+    }
+
+    virtual ~DOMFileSystem();
+
+    const String& name() const { return m_name; }
+    PassRefPtr<DirectoryEntry> root();
+
+    // ActiveDOMObject methods.
+    virtual void stop();
+    virtual bool hasPendingActivity() const;
+    virtual void contextDestroyed();
+
+    // Actual FileSystem API implementations.  All the validity checks on virtual paths are done at DOMFileSystem level.
+    void getMetadata(const Entry* entry, PassRefPtr<MetadataCallback> successCallback, PassRefPtr<ErrorCallback> errorCallback);
+    void move(const Entry* src, PassRefPtr<Entry> parent, const String& name, PassRefPtr<EntryCallback>, PassRefPtr<ErrorCallback>);
+    void copy(const Entry* src, PassRefPtr<Entry> parent, const String& name, PassRefPtr<EntryCallback>, PassRefPtr<ErrorCallback>);
+    void remove(const Entry* entry, PassRefPtr<VoidCallback>, PassRefPtr<ErrorCallback>);
+    void getParent(const Entry* entry, PassRefPtr<EntryCallback>, PassRefPtr<ErrorCallback>);
+    void getFile(const Entry* base, const String& path, PassRefPtr<Flags>, PassRefPtr<EntryCallback>, PassRefPtr<ErrorCallback>);
+    void getDirectory(const Entry* base, const String& path, PassRefPtr<Flags>, PassRefPtr<EntryCallback>, PassRefPtr<ErrorCallback>);
+    void readDirectory(const String& path, PassRefPtr<EntriesCallback>, PassRefPtr<ErrorCallback>);
+
+    // Schedule a callback. This should not cross threads (should be called on the same context thread).
+    template <typename CB, typename CBArg>
+    static void scheduleCallback(ScriptExecutionContext*, PassRefPtr<CB>, PassRefPtr<CBArg>);
+
+private:
+    DOMFileSystem(ScriptExecutionContext*, const String& name, PassOwnPtr<AsyncFileSystem>);
+
+    AsyncFileSystem* asyncFileSystem() const { return m_asyncFileSystem.get(); }
+
+    // A helper template to schedule a callback task.
+    // FIXME: move this to a more generic place.
+    template <typename CB, typename CBArg>
+    class DispatchCallbackTask : public ScriptExecutionContext::Task {
+    public:
+        DispatchCallbackTask(PassRefPtr<CB> callback, PassRefPtr<CBArg> arg)
+            : m_callback(callback)
+            , m_callbackArg(arg)
+        {
+        }
+
+        virtual void performTask(ScriptExecutionContext*)
+        {
+            m_callback->handleEvent(m_callbackArg.get());
+        }
+
+    private:
+        RefPtr<CB> m_callback;
+        RefPtr<CBArg> m_callbackArg;
+    };
+
+    String m_name;
+    mutable OwnPtr<AsyncFileSystem> m_asyncFileSystem;
+};
+
+template <typename CB, typename CBArg>
+void DOMFileSystem::scheduleCallback(ScriptExecutionContext* scriptExecutionContext, PassRefPtr<CB> callback, PassRefPtr<CBArg> arg)
+{
+    ASSERT(scriptExecutionContext->isContextThread());
+    scriptExecutionContext->postTask(new DispatchCallbackTask<CB, CBArg>(callback, arg));
+}
+
+} // namespace
+
+#endif // ENABLE(FILE_SYSTEM)
+
+#endif // DOMFileSystem_h