Adds special support to the device manager for keyboards devices.

ui/events/keyboard_device.h

Index: ui/events/keyboard_device.h
diff --git a/ui/events/keyboard_device.h b/ui/events/keyboard_device.h
new file mode 100644
index 0000000000000000000000000000000000000000..ab145ffbbcfc0e1edfc00543c31ac4024c0cfee8
--- /dev/null
+++ b/ui/events/keyboard_device.h
@@ -0,0 +1,22 @@
+// 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 UI_EVENTS_KEYBOARD_DEVICE_H_
+#define UI_EVENTS_KEYBOARD_DEVICE_H_
+
+#include <string>
+
+#include "ui/events/events_base_export.h"
+#include "ui/events/input_device.h"
+
+namespace ui {
+
+// Represents a Keyboard device state.
+struct EVENTS_BASE_EXPORT KeyboardDevice : public InputDevice {
+  KeyboardDevice(int id, InputDeviceType type, const std::string& name);
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_KEYBOARD_DEVICE_H_