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

ui/events/ozone/device/device_event.h

Index: ui/events/ozone/device/device_event.h
diff --git a/ui/events/ozone/device/device_event.h b/ui/events/ozone/device/device_event.h
new file mode 100644
index 0000000000000000000000000000000000000000..1f5e19b5ea1c3ec86c6e3f1b3af5aa11f53c50d2
--- /dev/null
+++ b/ui/events/ozone/device/device_event.h
@@ -0,0 +1,43 @@
+// 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_OZONE_DEVICE_EVENT_H_
+#define UI_EVENTS_OZONE_DEVICE_EVENT_H_
+
+#include "base/files/file_path.h"
+#include "base/macros.h"
+#include "ui/events/events_export.h"
+
+namespace ui {
+
+class EVENTS_EXPORT DeviceEvent {
+ public:
+  enum DeviceType {
+    INPUT,
+    DISPLAY,
+  };
+
+  enum ActionType {
+    ADD,
+    REMOVE,
+    CHANGE,
+  };
+
+  DeviceEvent(DeviceType type, ActionType action, const base::FilePath& path);
+
+  DeviceType device_type() const { return device_type_; }
+  ActionType action_type() const { return action_type_; }
+  base::FilePath path() const { return path_; }
+
+ private:
+  DeviceType device_type_;
+  ActionType action_type_;
+  base::FilePath path_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeviceEvent);
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_OZONE_DEVICE_EVENT_H_