Implement the Blink part of the Device Motion API.

Source/modules/device_orientation/DeviceMotionController.h

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 #ifndef DeviceMotionController_h
 #define DeviceMotionController_h
 
-#include "core/page/DeviceController.h"
+#include "core/dom/Event.h"
+#include "core/page/DOMWindow.h"
+#include "core/platform/RefCountedSupplement.h"
+#include "core/platform/Timer.h"
+#include <wtf/HashCountedSet.h>
 
 namespace WebCore {
 
-class DeviceMotionClient;
 class DeviceMotionData;
 
-class DeviceMotionController : public DeviceController {
+// FIXME: This class doesn't inherit from DeviceController anymore, which is a temporary
+// solution. Once the device orientation switches to the client-less design, move some of the
+// methods in this class to the DeviceController.

[Peter Beverloo, 2013/04/29 17:38:03]

Is this still relevant in your new design?  I'd remove the FIXME and just
address this when you're moving Device Orientation to this model as well.

[timvolodine, 2013/04/30 12:40:18]

Done.

+class DeviceMotionController : public RefCountedSupplement<Page, DeviceMotionController> {
+
 public:
-    ~DeviceMotionController() { };
+    virtual ~DeviceMotionController();
 
-    static PassOwnPtr<DeviceMotionController> create(DeviceMotionClient*);
+    static PassRefPtr<DeviceMotionController> create();
 
     void didChangeDeviceMotion(DeviceMotionData*);
-    DeviceMotionClient* deviceMotionClient();
 
-    virtual bool hasLastData() OVERRIDE;
-    virtual PassRefPtr<Event> getLastEvent() OVERRIDE;
+    virtual bool hasLastData();
+    virtual PassRefPtr<Event> getLastEvent();
 
     static const char* supplementName();
     static DeviceMotionController* from(Page*);
     static bool isActiveAt(Page*);
 
+    // FIXME move these methods to DeviceController
+    void dispatchDeviceEvent(const PassRefPtr<Event>);
+    bool isActive() { return !m_listeners.isEmpty(); }
+
+    void addDeviceEventListener(DOMWindow*);
+    void removeDeviceEventListener(DOMWindow*);
+    void removeAllDeviceEventListeners(DOMWindow*);
+
 private:
-    explicit DeviceMotionController(DeviceMotionClient*);
+    DeviceMotionController() : m_timer(this, &DeviceMotionController::fireDeviceEvent) { }
+
+    void startUpdating();
+    void stopUpdating();
+    void fireDeviceEvent(Timer<DeviceMotionController>*);
+    void dispatchEventToActiveDocuments(Vector<RefPtr<DOMWindow> >&, const PassRefPtr<Event>);
+
+    HashCountedSet<RefPtr<DOMWindow> > m_listeners;

[Peter Beverloo, 2013/04/29 17:38:03]

Adam replied to having RefPtr<>s to DOMWindow in your previous CL, did you give
that any thought?

[timvolodine, 2013/04/30 12:40:18]

I would prefer to address this in a separate CL though. Adam mentioned using
WeakPtr or subclass from ContextDestructionObserver, I'll have to investigate
what would be better to use.

+    HashCountedSet<RefPtr<DOMWindow> > m_lastEventListeners;
+    Timer<DeviceMotionController> m_timer;
 };
 
+void provideDeviceMotionTo(Page*);
+
 } // namespace WebCore
 
 #endif // DeviceMotionController_h