Gamepad API: add support for gamepadconnected and gamepaddisconnected events

public/platform/WebGamepadListener.h

Index: public/platform/WebGamepadListener.h
diff --git a/public/platform/WebGamepadListener.h b/public/platform/WebGamepadListener.h
new file mode 100644
index 0000000000000000000000000000000000000000..f73049e461268542a1f2c1b31be17f2d1889a2f5
--- /dev/null
+++ b/public/platform/WebGamepadListener.h
@@ -0,0 +1,23 @@
+// 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 WebGamepadListener_h
+#define WebGamepadListener_h
+
+namespace blink {
+
+class WebGamepad;
+
+class WebGamepadListener {
+public:
+    virtual void didConnectGamepad(unsigned index, const blink::WebGamepad&) = 0;
+    virtual void didDisconnectGamepad(unsigned index, const blink::WebGamepad&) = 0;
+
+protected:
+    virtual ~WebGamepadListener() { }
+};
+
+} // namespace blink
+
+#endif