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

ui/events/ozone/evdev/scoped_udev.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_OZONE_EVDEV_SCOPED_UDEV_H_
-#define UI_EVENTS_OZONE_EVDEV_SCOPED_UDEV_H_
-
-#include <libudev.h>
-
-#include "base/memory/scoped_ptr.h"
-
-// This file enables management of udev object references using scoped_ptr<> by
-// associating a custom deleter that drops the reference rather than deleting.
-
-namespace ui {
-
-// Scoped struct udev.
-struct UdevDeleter {
-  void operator()(struct udev* udev) { udev_unref(udev); }
-};
-typedef scoped_ptr<struct udev, UdevDeleter> scoped_udev;
-
-// Scoped struct udev_device.
-struct UdevDeviceDeleter {
-  void operator()(struct udev_device* udev_device) {
-    udev_device_unref(udev_device);
-  }
-};
-typedef scoped_ptr<struct udev_device, UdevDeviceDeleter> scoped_udev_device;
-
-// Scoped struct udev_enumerate.
-struct UdevEnumerateDeleter {
-  void operator()(struct udev_enumerate* udev_enumerate) {
-    udev_enumerate_unref(udev_enumerate);
-  }
-};
-typedef scoped_ptr<struct udev_enumerate, UdevEnumerateDeleter>
-    scoped_udev_enumerate;
-
-// Scoped struct udev_monitor.
-struct UdevMonitorDeleter {
-  void operator()(struct udev_monitor* udev_monitor) {
-    udev_monitor_unref(udev_monitor);
-  }
-};
-typedef scoped_ptr<struct udev_monitor, UdevMonitorDeleter> scoped_udev_monitor;
-
-}  // namespace ui
-
-#endif  // UI_EVENTS_OZONE_EVDEV_SCOPED_UDEV_H_