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diff --git a/Tools/DumpRenderTree/chromium/Task.h b/Tools/DumpRenderTree/chromium/Task.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 Task_h
+#define Task_h
+
+#include <wtf/Vector.h>
+
+class TaskList;
+
+// WebTask represents a task which can run by postTask() or postDelayedTask().
+// it is named "WebTask", not "Task", to avoid conflist with base/task.h.
+class WebTask {
+public:
+    WebTask(TaskList*);
+    // The main code of this task.
+    // An implementation of run() should return immediately if cancel() was called.
+    virtual void run() = 0;
+    virtual void cancel() = 0;
+    virtual ~WebTask();
+protected:
+    TaskList* m_taskList;
+};
+
+class TaskList {
+public:
+    TaskList() {}
+    ~TaskList() { revokeAll(); }
+    void registerTask(WebTask* task) { m_tasks.append(task); }
+    void unregisterTask(WebTask* task);
+    void revokeAll();
+private:
+    Vector<WebTask*> m_tasks;
+};
+
+// A task containing an object pointer of class T. Is is supposed that
+// runifValid() calls a member function of the object pointer.
+// Class T must have "TaskList* taskList()".
+template<class T> class MethodTask: public WebTask {
+public:
+    MethodTask(T* object): WebTask(object->taskList()), m_object(object) {}
+    virtual void run()
+    {
+        if (m_object)
+            runIfValid();
+    }
+    virtual void cancel()
+    {
+        m_object = 0;
+        m_taskList->unregisterTask(this);
+        m_taskList = 0;
+    }
+    virtual void runIfValid() = 0;
+protected:
+    T* m_object;
+};
+
+void postTask(WebTask* task);
+void postDelayedTask(WebTask* task, int64_t ms);
+
+#endif // Task_h