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

ui/events/ozone/monitor_udev.h

Index: ui/events/ozone/monitor_udev.h
diff --git a/ui/events/ozone/monitor_udev.h b/ui/events/ozone/monitor_udev.h
new file mode 100644
index 0000000000000000000000000000000000000000..1bb7baaf9d70426292988de902d1be66d0f1dfac
--- /dev/null
+++ b/ui/events/ozone/monitor_udev.h
@@ -0,0 +1,26 @@
+// 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_MONITOR_UDEV_H_
+#define UI_EVENTS_OZONE_MONITOR_UDEV_H_
+
+#include "ui/events/events_export.h"
+#include "ui/events/ozone/scoped_udev.h"
+
+namespace ui {
+
+// Interface for a Udev device monitor. Implementors will register with
+// DeviceUdev and receive events when changes to devices are detected.

[spang, 2014/04/25 20:42:07]

You could probably delete this entire interface and just have
 
 // ui/events/ozone/udev/udev.h
 typedef base::Callback<void(udev_device *)> UdevDeviceCallback;

Also, I don't think there's any advantage to passing ownership of the
udev_device to the callee.

+class EVENTS_EXPORT MonitorUdev {
+ public:
+  virtual ~MonitorUdev() {};
+
+  // Called when a Udev event is processed. |device| is the Udev device that
+  // triggered the event.
+  virtual void HandleUdevEvent(scoped_udev_device device) = 0;
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_OZONE_MONITOR_UDEV_H_