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..526b0054cfe1dfbb72e813769edda82a54bdd960
--- /dev/null
+++ b/ui/events/input_device.h
@@ -0,0 +1,39 @@
+// 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 {
+  INPUT_DEVICE_INTERNAL,  // Internally connected input device.
+  INPUT_DEVICE_EXTERNAL,  // Known externally connected input device.
+  INPUT_DEVICE_UNKNOWN,   // Device that may or may not be an external device.
+};
+
+// Represents an input device state.
+struct EVENTS_BASE_EXPORT InputDevice {
+  static const unsigned int kInvalidId;
+
+  InputDevice(unsigned int id, InputDeviceType type, const std::string& name);
+  virtual ~InputDevice();
+
+  // ID of the device. This ID is unique between all input devices.
+  unsigned 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_