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diff --git a/Source/WebCore/dom/DeviceMotionController.cpp b/Source/WebCore/dom/DeviceMotionController.cpp
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+++ b/Source/WebCore/dom/DeviceMotionController.cpp
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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.
+ */
+
+#include "config.h"
+#include "DeviceMotionController.h"
+
+#include "DeviceMotionClient.h"
+#include "DeviceMotionData.h"
+#include "DeviceMotionEvent.h"
+
+namespace WebCore {
+
+DeviceMotionController::DeviceMotionController(DeviceMotionClient* client)
+    : m_client(client)
+    , m_timer(this, &DeviceMotionController::timerFired)
+{
+    ASSERT(m_client);
+    m_client->setController(this);
+}
+
+DeviceMotionController::~DeviceMotionController()
+{
+    m_client->deviceMotionControllerDestroyed();
+}
+
+void DeviceMotionController::timerFired(Timer<DeviceMotionController>* timer)
+{
+    ASSERT_UNUSED(timer, timer == &m_timer);
+    ASSERT(!m_client || m_client->currentDeviceMotion());
+    m_timer.stop();
+    
+    RefPtr<DeviceMotionData> deviceMotionData = m_client ? m_client->currentDeviceMotion() : DeviceMotionData::create();
+    RefPtr<DeviceMotionEvent> event = DeviceMotionEvent::create(eventNames().devicemotionEvent, deviceMotionData.get());
+ 
+    Vector<DOMWindow*> listenersVector;
+    copyToVector(m_newListeners, listenersVector);
+    m_newListeners.clear();
+    for (size_t i = 0; i < listenersVector.size(); ++i)
+        listenersVector[i]->dispatchEvent(event);
+}
+    
+void DeviceMotionController::addListener(DOMWindow* window)
+{
+    // If no client is present or the client already has motion data,
+    // immediately trigger an asynchronous response.
+    if (!m_client || m_client->currentDeviceMotion()) {
+        m_newListeners.add(window);
+        if (!m_timer.isActive())
+            m_timer.startOneShot(0);
+    }
+    
+    bool wasEmpty = m_listeners.isEmpty();
+    m_listeners.add(window);
+    if (wasEmpty && m_client)
+        m_client->startUpdating();
+}
+
+void DeviceMotionController::removeListener(DOMWindow* window)
+{
+    m_listeners.remove(window);
+    m_newListeners.remove(window);
+    if (m_listeners.isEmpty() && m_client)
+        m_client->stopUpdating();
+}
+
+void DeviceMotionController::removeAllListeners(DOMWindow* window)
+{
+    // May be called with a DOMWindow that's not a listener.
+    if (!m_listeners.contains(window))
+        return;
+
+    m_listeners.removeAll(window);
+    m_newListeners.remove(window);
+    if (m_listeners.isEmpty() && m_client)
+        m_client->stopUpdating();
+}
+
+void DeviceMotionController::didChangeDeviceMotion(DeviceMotionData* deviceMotionData)
+{
+    RefPtr<DeviceMotionEvent> event = DeviceMotionEvent::create(eventNames().devicemotionEvent, deviceMotionData);
+    Vector<DOMWindow*> listenersVector;
+    copyToVector(m_listeners, listenersVector);
+    for (size_t i = 0; i < listenersVector.size(); ++i)
+        listenersVector[i]->dispatchEvent(event);
+}
+
+} // namespace WebCore