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diff --git a/Source/WebCore/dom/DeviceMotionController.h b/Source/WebCore/dom/DeviceMotionController.h
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+++ b/Source/WebCore/dom/DeviceMotionController.h
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+/*
+ * Copyright 2010 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:
+ *  * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``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 DeviceMotionController_h
+#define DeviceMotionController_h
+
+#include "DOMWindow.h"
+#include "Timer.h"
+#include <wtf/HashCountedSet.h>
+
+namespace WebCore {
+
+class DeviceMotionData;
+class DeviceMotionClient;
+
+class DeviceMotionController {
+public:
+    DeviceMotionController(DeviceMotionClient*);
+    ~DeviceMotionController();
+
+    void addListener(DOMWindow*);
+    void removeListener(DOMWindow*);
+    void removeAllListeners(DOMWindow*);
+
+    void didChangeDeviceMotion(DeviceMotionData*);
+
+    bool isActive() { return !m_listeners.isEmpty(); }
+
+private:
+    void timerFired(Timer<DeviceMotionController>*);
+    
+    DeviceMotionClient* m_client;
+    typedef HashCountedSet<RefPtr<DOMWindow> > ListenersCountedSet;
+    ListenersCountedSet m_listeners;
+    typedef HashSet<RefPtr<DOMWindow> > ListenersSet;
+    ListenersSet m_newListeners;
+    Timer<DeviceMotionController> m_timer;
+};
+
+} // namespace WebCore
+
+#endif // DeviceMotionController_h