Gamepad API: add support for gamepadconnected and gamepaddisconnected events

Source/modules/gamepad/GamepadDispatcher.h

+// 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 GamepadDispatcher_h
+#define GamepadDispatcher_h
+
+#include "core/frame/DeviceSensorEventDispatcher.h"
+#include "public/platform/WebGamepadListener.h"
+
+namespace blink {
+class WebGamepad;
+class WebGamepads;
+}
+
+namespace WebCore {
+
+class NavigatorGamepad;
+
+class GamepadDispatcher : public DeviceSensorEventDispatcher, public blink::WebGamepadListener {
+public:
+    static GamepadDispatcher& instance();
+
+    void addClient(NavigatorGamepad*);
+    void removeClient(NavigatorGamepad*);
+    void sampleGamepads(blink::WebGamepads&);
+
+private:
+    GamepadDispatcher();
+    virtual ~GamepadDispatcher();
+
+    virtual void didConnectGamepad(unsigned index, const blink::WebGamepad&) OVERRIDE;
+    virtual void didDisconnectGamepad(unsigned index, const blink::WebGamepad&) OVERRIDE;
+    void dispatchDidConnectOrDisconnectGamepad(unsigned index, const blink::WebGamepad&, bool connected);
+
+    virtual void startListening() OVERRIDE;
+    virtual void stopListening() OVERRIDE;
+};
+
+} // namespace WebCore
+
+#endif