Adds special support to the device manager for keyboards devices.

ui/events/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 
 static_library("dom4_keycode_converter") {
   sources = [
     "keycodes/dom4/keycode_converter.cc",
     "keycodes/dom4/keycode_converter.h",
@@ skipping 11 matching lines @@
     "event_constants.h",
     "event_switches.cc",
     "event_switches.h",
     "events_base_export.h",
     "gesture_event_details.cc",
     "gesture_event_details.h",
     "gestures/fling_curve.cc",
     "gestures/fling_curve.h",
     "gestures/gesture_configuration.cc",
     "gestures/gesture_configuration.h",
+    "input_device.cc",
+    "input_device.h",
+    "keyboard_device.cc",
+    "keyboard_device.h",
     "keycodes/keyboard_code_conversion.cc",
     "keycodes/keyboard_code_conversion.h",
     "keycodes/keyboard_code_conversion_android.cc",
     "keycodes/keyboard_code_conversion_android.h",
     "keycodes/keyboard_code_conversion_mac.h",
     "keycodes/keyboard_code_conversion_mac.mm",
     "keycodes/keyboard_code_conversion_win.cc",
     "keycodes/keyboard_code_conversion_win.h",
     "keycodes/keyboard_codes.h",
     "latency_info.cc",
@@ skipping 279 matching lines @@
       "ozone/evdev/touch_event_converter_evdev_unittest.cc",
     ]
   }
 
   if (use_aura) {
     sources += [
       "gestures/gesture_provider_aura_unittest.cc",
     ]
   }
 }