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

ui/events/ozone/device/udev/device_manager_udev.h

Index: ui/events/ozone/device/udev/device_manager_udev.h
diff --git a/ui/events/ozone/device/udev/device_manager_udev.h b/ui/events/ozone/device/udev/device_manager_udev.h
new file mode 100644
index 0000000000000000000000000000000000000000..e9be943f236590f2848fd416b8ffccf35488e343
--- /dev/null
+++ b/ui/events/ozone/device/udev/device_manager_udev.h
@@ -0,0 +1,48 @@
+// 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_UDEV_DEVICE_MANAGER_UDEV_H_
+#define UI_EVENTS_OZONE_DEVICE_UDEV_DEVICE_MANAGER_UDEV_H_
+
+#include "base/message_loop/message_pump_libevent.h"
+#include "base/observer_list.h"
+#include "ui/events/ozone/device/device_manager.h"
+#include "ui/events/ozone/device/udev/scoped_udev.h"
+
+namespace ui {
+
+class DeviceEvent;
+class DeviceEventObserver;
+
+class DeviceManagerUdev
+    : public DeviceManager, base::MessagePumpLibevent::Watcher {
+ public:
+  DeviceManagerUdev();
+  virtual ~DeviceManagerUdev();
+
+ private:
+  scoped_ptr<DeviceEvent> ProcessMessage(udev_device* device);
+
+  // DeviceManager overrides:
+  virtual void ScanDevices(DeviceEventObserver* observer) OVERRIDE;
+  virtual void AddObserver(DeviceEventObserver* observer) OVERRIDE;
+  virtual void RemoveObserver(DeviceEventObserver* observer) OVERRIDE;
+
+  // base::MessagePumpLibevent::Watcher overrides:
+  virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
+  virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE;
+
+  scoped_udev udev_;
+  scoped_udev_monitor monitor_;
+
+  base::MessagePumpLibevent::FileDescriptorWatcher controller_;
+
+  ObserverList<DeviceEventObserver> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeviceManagerUdev);
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_OZONE_DEVICE_UDEV_DEVICE_MANAGER_UDEV_H_