ozone: evdev: Add gamepad support

ui/events/event_handler.h

 // Copyright (c) 2012 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 UI_EVENTS_EVENT_HANDLER_H_
 #define UI_EVENTS_EVENT_HANDLER_H_
 
 #include <stack>
 #include <vector>
 
 #include "base/macros.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/events_export.h"
 
 namespace ui {
 
+class GamepadEvent;
 class CancelModeEvent;
 class Event;
 class EventDispatcher;
 class GestureEvent;
 class KeyEvent;
 class MouseEvent;
 class ScrollEvent;
 class TouchEvent;
 
 // Dispatches events to appropriate targets.  The default implementations of
 // all of the specific handlers (e.g. OnKeyEvent, OnMouseEvent) do nothing.
 class EVENTS_EXPORT EventHandler {
  public:
   EventHandler();
   virtual ~EventHandler();
 
   // This is called for all events. The default implementation routes the event
   // to one of the event-specific callbacks (OnKeyEvent, OnMouseEvent etc.). If
   // this is overridden, then normally, the override should chain into the
   // default implementation for un-handled events.
   virtual void OnEvent(Event* event);
 
+  virtual void OnGamepadEvent(GamepadEvent* event);
+
   virtual void OnKeyEvent(KeyEvent* event);
 
   virtual void OnMouseEvent(MouseEvent* event);
 
   virtual void OnScrollEvent(ScrollEvent* event);
 
   virtual void OnTouchEvent(TouchEvent* event);
 
   virtual void OnGestureEvent(GestureEvent* event);
 
   virtual void OnCancelMode(CancelModeEvent* event);
 
  private:
   friend class EventDispatcher;
 
   // EventDispatcher pushes itself on the top of this stack while dispatching
   // events to this then pops itself off when done.
   std::stack<EventDispatcher*> dispatchers_;
 
   DISALLOW_COPY_AND_ASSIGN(EventHandler);
 };
 
 typedef std::vector<EventHandler*> EventHandlerList;
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_HANDLER_H_