Refactor Udev device support in Ozone and add a DRM hotplug monitor

ui/events/events.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 123 matching lines @@
         'ozone/evdev/event_device_info.cc',
         'ozone/evdev/event_device_info.h',
         'ozone/evdev/event_factory_evdev.cc',
         'ozone/evdev/event_factory_evdev.h',
         'ozone/evdev/event_modifiers_evdev.cc',
         'ozone/evdev/event_modifiers_evdev.h',
         'ozone/evdev/key_event_converter_evdev.cc',
         'ozone/evdev/key_event_converter_evdev.h',
         'ozone/evdev/touch_event_converter_evdev.cc',
         'ozone/evdev/touch_event_converter_evdev.h',
+        'ozone/device_udev.cc',
+        'ozone/device_udev.h',
         'ozone/event_factory_ozone.cc',
         'ozone/event_factory_ozone.h',
         'ozone/events_ozone.cc',
+        'ozone/monitor_udev.h',
+        'ozone/scoped_udev.h',
         'platform/platform_event_dispatcher.h',
         'platform/platform_event_observer.h',
         'platform/platform_event_source.cc',
         'platform/platform_event_source.h',
         'platform/platform_event_source_stub.cc',
         'platform/platform_event_types.h',
         'platform/scoped_event_dispatcher.cc',
         'platform/scoped_event_dispatcher.h',
         'platform/x11/x11_event_source.cc',
         'platform/x11/x11_event_source.h',
@@ skipping 59 matching lines @@
           ],
           'defines': [
             'USE_EVDEV_GESTURES',
           ],
         }, {
           'sources/': [
             ['exclude', '^ozone/evdev/libgestures_glue/'],
           ],
         }],
         ['use_udev==0', {
-          'sources!': [
-            'ozone/evdev/device_manager_udev.cc',
-            'ozone/evdev/device_manager_udev.h',
+          'sources/': [
+            ['exclude', '_udev\\.(h|cc)$'],
           ],
         }],
       ],
     },
     {
       'target_name': 'gesture_detection',
       'type': '<(component)',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
@@ skipping 153 matching lines @@
           ],
           'variables': {
             'test_suite_name': 'events_unittests',
           },
           'includes': [ '../../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }