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

ui/ozone/platform/dri/chromeos/display_event_listener_udev.h

Index: ui/ozone/platform/dri/chromeos/display_event_listener_udev.h
diff --git a/ui/ozone/platform/dri/chromeos/display_event_listener_udev.h b/ui/ozone/platform/dri/chromeos/display_event_listener_udev.h
new file mode 100644
index 0000000000000000000000000000000000000000..b468b119c6f819c0deef145ea6c0159d34e44226
--- /dev/null
+++ b/ui/ozone/platform/dri/chromeos/display_event_listener_udev.h
@@ -0,0 +1,36 @@
+// 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_OZONE_PLATFORM_DRI_CHROMEOS_DISPLAY_EVENT_LISTENER_UDEV_H_
+#define UI_OZONE_PLATFORM_DRI_CHROMEOS_DISPLAY_EVENT_LISTENER_UDEV_H_
+
+#include "base/macros.h"
+#include "ui/events/ozone/monitor_udev.h"
+#include "ui/ozone/platform/dri/chromeos/display_event_listener.h"
+
+namespace ui {
+
+class DeviceUdev;
+
+class DisplayEventListenerUdev : public DisplayEventListener, MonitorUdev {
+ public:
+  DisplayEventListenerUdev(DeviceUdev* udev);
+  virtual ~DisplayEventListenerUdev();
+
+ private:
+  // DisplayEventListener overrides:
+  virtual void StartMonitoring(const DisplayEventCallback& callback) OVERRIDE;
+
+  // MonitorUdev overrides:
+  virtual void HandleUdevEvent(scoped_udev_device device) OVERRIDE;
+
+  DeviceUdev* udev_;
+  DisplayEventCallback callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(DisplayEventListenerUdev);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRI_CHROMEOS_DISPLAY_EVENT_LISTENER_UDEV_H_