Adds special support to the device manager for keyboards devices.

ui/events/keyboard_device.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 UI_EVENTS_KEYBOARD_DEVICE_H_
+#define UI_EVENTS_KEYBOARD_DEVICE_H_
+
+#include "ui/events/events_base_export.h"
+
+namespace ui {
+
+enum KeyboardDeviceType {

[flackr, 2014/10/02 15:41:10]

Document what these types mean.

[rsadam, 2014/10/02 15:50:05]

Done.

+  INTERNAL,
+  TEST,

[sadrul, 2014/10/02 15:53:53]

I don't think we should have this.

[rsadam, 2014/10/02 22:52:27]

Done.

+  EXTERNAL,
+  UNKNOWN,

[flackr, 2014/10/02 15:41:10]

Also specifically that a real keyboard may be identified as unknown (could
mention if it doesn't have "keyboard" in device name) just to ensure this type
isn't relied upon.

[rsadam, 2014/10/02 15:50:05]

Done.

+};
+
+// Represents a Keyboard device state.
+struct EVENTS_BASE_EXPORT KeyboardDevice {
+  KeyboardDevice(int id, KeyboardDeviceType type);
+
+  // ID of the device. This ID must uniquely identify the keyboard device.
+  int id;
+
+  // The type of the keyboard device.
+  KeyboardDeviceType type;

[sadrul, 2014/10/02 15:53:53]

For TouchscreenDevice, we use a bool |is_internal| instead. It would be useful
to have the same approach here too. Or alternatively:

. Have a generic InputDevice
  - id (will be kInvalidId if unknown ]
  - type: [ internal, external, unknown ]
  - name (optional)

. TouchscreenDevice : InputDevice
  - size

. KeyboardDevice : InputDevice

[rsadam, 2014/10/02 22:52:27]

Done.

+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_KEYBOARD_DEVICE_H_