Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/events/platform/x11/x11_hotplug_event_handler.h

Index: ui/events/platform/x11/x11_hotplug_event_handler.h
diff --git a/ui/events/platform/x11/x11_hotplug_event_handler.h b/ui/events/platform/x11/x11_hotplug_event_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..16d3b038fba8361f80452b1cef1a714e54cb75bd
--- /dev/null
+++ b/ui/events/platform/x11/x11_hotplug_event_handler.h
@@ -0,0 +1,33 @@
+// 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_PLATFORM_X11_X11_HOTPLUG_EVENT_HANDLER_H_
+#define UI_EVENTS_PLATFORM_X11_X11_HOTPLUG_EVENT_HANDLER_H_
+
+#include "ui/events/devices/x11/device_list_cache_x11.h"
+#include "ui/gfx/x/x11_atom_cache.h"
+
+namespace ui {
+
+class DeviceHotplugEventObserver;
+
+// Parses X11 native devices and propagates the list of active devices to an
+// observer.
+class X11HotplugEventHandler {
+ public:
+  X11HotplugEventHandler();
+  ~X11HotplugEventHandler();
+
+  // Called on an X11 hotplug event.
+  void OnHotplugEvent();
+
+ private:
+  X11AtomCache atom_cache_;
+
+  DISALLOW_COPY_AND_ASSIGN(X11HotplugEventHandler);
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_PLATFORM_X11_X11_HOTPLUG_EVENT_HANDLER_H_