Adds special support to the device manager for keyboards devices.

ui/events/input_device.h

Index: ui/events/input_device.h
diff --git a/ui/events/input_device.h b/ui/events/input_device.h
new file mode 100644
index 0000000000000000000000000000000000000000..3dcf4e9a070fc4f7b18cb2b329083ba1e21d3383
--- /dev/null
+++ b/ui/events/input_device.h
@@ -0,0 +1,38 @@
+// 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_INPUT_DEVICE_H_
+#define UI_EVENTS_INPUT_DEVICE_H_
+
+#include <string>
+
+#include "ui/events/events_base_export.h"
+
+namespace ui {
+
+enum InputDeviceType {
+  INTERNAL,  // Internal device.

[sky, 2014/10/20 22:18:44]

It's not clear what internal or external mean in this context.

[sky, 2014/10/20 22:18:44]

Prefix with enum name, eg INPUT_DEVICE_INTERNAL.

+  EXTERNAL,  // Known external device.
+  UNKNOWN,   // Device that may or may not be an external device.
+};
+
+// Represents an input device state.
+struct EVENTS_BASE_EXPORT InputDevice {
+  static const int kInvalidId;
+
+  InputDevice(int id, InputDeviceType type, const std::string& name);
+

[sky, 2014/10/20 22:18:44]

Don't you need a virtual destructor?

+  // ID of the device. This ID must uniquely identify the input device.
+  int id;
+
+  // The type of the input device.
+  InputDeviceType type;
+
+  // Name of the device.
+  std::string name;
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_INPUT_DEVICE_H_