Gamepad API: add support for connection events

content/browser/gamepad/gamepad_consumer.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 CONTENT_BROWSER_GAMEPAD_GAMEPAD_CONSUMER_H
+#define CONTENT_BROWSER_GAMEPAD_GAMEPAD_CONSUMER_H
+
+#include "base/basictypes.h"
+#include "content/common/content_export.h"
+#include "third_party/WebKit/public/platform/WebGamepad.h"
+
+namespace content {
+
+class CONTENT_EXPORT GamepadConsumer {
+ public:
+  virtual void OnGamepadConnected(
+      unsigned index,
+      const blink::WebGamepad& gamepad) = 0;
+  virtual void OnGamepadDisconnected(
+      unsigned index,
+      const blink::WebGamepad& gamepad) = 0;
+
+ protected:
+  virtual ~GamepadConsumer() {}
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_CONSUMER_H