Implement DeviceLight

Source/modules/device_light/DeviceLightController.h

Index: Source/modules/device_light/DeviceLightController.h
diff --git a/Source/modules/device_light/DeviceLightController.h b/Source/modules/device_light/DeviceLightController.h
new file mode 100644
index 0000000000000000000000000000000000000000..e32c47701409098f6f76d6ba053f160900af10b5
--- /dev/null
+++ b/Source/modules/device_light/DeviceLightController.h
@@ -0,0 +1,48 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef DeviceLightController_h
+#define DeviceLightController_h
+
+#include "core/dom/DocumentSupplementable.h"
+#include "core/events/Event.h"
+#include "core/frame/DOMWindowLifecycleObserver.h"
+#include "core/frame/DeviceSensorEventController.h"
+
+namespace WebCore {
+
+class DOMWindow;
+
+class DeviceLightController FINAL : public DeviceSensorEventController, public DocumentSupplement, public DOMWindowLifecycleObserver {
+
+public:
+    virtual ~DeviceLightController();
+
+    static const char* supplementName();
+    static DeviceLightController& from(Document&);
+
+    void didChangeDeviceLight(double);
+    virtual void trace(Visitor*) OVERRIDE { }
+
+private:
+    explicit DeviceLightController(Document&);
+    virtual void registerWithDispatcher() OVERRIDE;
+    virtual void unregisterWithDispatcher() OVERRIDE;
+
+    // Inherited from DOMWindowLifecycleObserver.
+    virtual void didAddEventListener(DOMWindow*, const AtomicString&) OVERRIDE;
+    virtual void didRemoveEventListener(DOMWindow*, const AtomicString&) OVERRIDE;
+    virtual void didRemoveAllEventListeners(DOMWindow*) OVERRIDE;
+
+    virtual bool hasLastData() OVERRIDE;
+    virtual PassRefPtrWillBeRawPtr<Event> getLastEvent() OVERRIDE;
+    virtual bool isNullEvent(Event*) OVERRIDE;
+    virtual Document* document() OVERRIDE;
+
+    Document& m_document;
+};
+
+} // namespace WebCore
+
+#endif // DeviceLightController_h