Blink: make the dispatchDeviceEvent virtual to allow overrides in subclasses.

Source/core/frame/DeviceSensorEventController.h

 /*
  * Copyright (C) 2013 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 26 matching lines @@
 class DeviceSensorEventController : public PageLifecycleObserver {
 
 public:
     void startUpdating();
     void stopUpdating();
 
 protected:
     explicit DeviceSensorEventController(Document&);
     virtual ~DeviceSensorEventController();
 
-    void dispatchDeviceEvent(const PassRefPtrWillBeRawPtr<Event>);
+    // Default dispatch is on DOMWindow, override in deriving class if necessary.
+    virtual void dispatchDeviceEvent(const PassRefPtrWillBeRawPtr<Event>);
 
     virtual bool hasLastData() = 0;
     virtual PassRefPtrWillBeRawPtr<Event> getLastEvent() = 0;
     virtual void registerWithDispatcher() = 0;
     virtual void unregisterWithDispatcher() = 0;
     virtual bool isNullEvent(Event*) = 0;
 
     bool m_hasEventListener;
 
 private:
     // Inherited from PageLifecycleObserver.
     virtual void pageVisibilityChanged() OVERRIDE FINAL;
 
     void fireDeviceEvent(Timer<DeviceSensorEventController>*);
 
     Document& m_document;
     bool m_isActive;
     bool m_needsCheckingNullEvents;
     Timer<DeviceSensorEventController> m_timer;
 };
 
 } // namespace WebCore
 
 #endif // DeviceSensorEventController_h