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

ui/events/ozone/evdev/device_manager_evdev.cc

-// 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.
-
-#include "ui/events/ozone/evdev/device_manager_evdev.h"
-
-#include "base/files/file_enumerator.h"
-#include "base/files/file_path.h"
-
-namespace ui {
-
-namespace {
-
-class DeviceManagerManual : public DeviceManagerEvdev {
- public:
-  DeviceManagerManual() {}
-  virtual ~DeviceManagerManual() {}
-
-  // Enumerate existing devices & start watching for device changes.
-  virtual void ScanAndStartMonitoring(const EvdevDeviceCallback& device_added,
-                                      const EvdevDeviceCallback& device_removed)
-      OVERRIDE {
-    base::FileEnumerator file_enum(base::FilePath("/dev/input"),
-                                   false,
-                                   base::FileEnumerator::FILES,
-                                   "event*[0-9]");
-    for (base::FilePath path = file_enum.Next(); !path.empty();
-         path = file_enum.Next())
-      device_added.Run(path);
-  }
-
-  virtual void Stop() OVERRIDE {}
-};
-
-}  // namespace
-
-DeviceManagerEvdev::~DeviceManagerEvdev() {}
-
-scoped_ptr<DeviceManagerEvdev> CreateDeviceManagerManual() {
-  return make_scoped_ptr<DeviceManagerEvdev>(new DeviceManagerManual);
-}
-
-}  // namespace ui