Keep the mouse cursor within desktop

ui/aura/monitor_change_observer_x11.h

Index: ui/aura/monitor_change_observer_x11.h
diff --git a/ui/aura/monitor_change_observer_x11.h b/ui/aura/monitor_change_observer_x11.h
index 1c4a323f10f7949c6a4047d5ba739b3b81d1c7ad..f9a9ecd684b20548c7c76ab8e405d763834a469e 100644
--- a/ui/aura/monitor_change_observer_x11.h
+++ b/ui/aura/monitor_change_observer_x11.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef UI_AURA_MONITOR_CHANGE_OBSERVER_H
-#define UI_AURA_MONITOR_CHANGE_OBSERVER_H
+#ifndef UI_AURA_MONITOR_CHANGE_OBSERVER_X11_H
+#define UI_AURA_MONITOR_CHANGE_OBSERVER_X11_H
 #pragma once
 
 #include <X11/Xlib.h>
@@ -12,18 +12,21 @@
 #undef RootWindow
 
 #include "base/basictypes.h"
-#include "ui/aura/aura_export.h"
+#include "base/message_loop.h"
 
 namespace aura {
+namespace internal {
 
 // An object that observes changes in monitor configuration and
 // update MonitorManagers.
-class AURA_EXPORT MonitorChangeObserverX11 {
+class MonitorChangeObserverX11 : public MessageLoop::Dispatcher {
  public:
   MonitorChangeObserverX11();
   ~MonitorChangeObserverX11();
 
-  bool Dispatch(const XEvent* event);
+  // Overridden from Dispatcher overrides:
+  virtual base::MessagePumpDispatcher::DispatchStatus Dispatch(
+      XEvent* xev) OVERRIDE;
 
   // Reads monitor configurations from the system and notifies
   // |monitor_manager_| about the change.
@@ -39,6 +42,7 @@ class AURA_EXPORT MonitorChangeObserverX11 {
   DISALLOW_COPY_AND_ASSIGN(MonitorChangeObserverX11);
 };
 
+}  // namespace internal
 }  // namespace aura
 
-#endif  // UI_AURA_MONITOR_CHANGE_OBSERVER_H
+#endif  // UI_AURA_MONITOR_CHANGE_OBSERVER_X11_H