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diff --git a/WebCore/fileapi/FileThread.h b/WebCore/fileapi/FileThread.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 FileThread_h
+#define FileThread_h
+
+#if ENABLE(BLOB) || ENABLE(FILE_WRITER)
+
+#include <wtf/MessageQueue.h>
+#include <wtf/PassOwnPtr.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/Threading.h>
+
+namespace WebCore {
+
+class FileStream;
+
+class FileThread : public ThreadSafeShared<FileThread> {
+public:
+    static PassRefPtr<FileThread> create()
+    {
+        return adoptRef(new FileThread());
+    }
+
+    ~FileThread();
+
+    bool start();
+    void stop();
+
+    class Task : public Noncopyable {
+    public:
+        virtual ~Task() { }
+        virtual void performTask() = 0;
+        void* instance() const { return m_instance; }
+    protected:
+        Task(void* instance) : m_instance(instance) { }
+        void* m_instance;
+    };
+
+    void postTask(PassOwnPtr<Task> task);
+
+    void unscheduleTasks(const void* instance);
+
+private:
+    FileThread();
+
+    static void* fileThreadStart(void*);
+    void* runLoop();
+
+    ThreadIdentifier m_threadID;
+    RefPtr<FileThread> m_selfRef;
+    MessageQueue<Task> m_queue;
+
+    Mutex m_threadCreationMutex;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(BLOB) || ENABLE(FILE_WRITER)
+
+#endif // FileThread_h