Keep the mouse cursor within desktop

ui/aura/root_window_host_linux.h

 // Copyright (c) 2012 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_AURA_ROOT_WINDOW_HOST_LINUX_H_
 #define UI_AURA_ROOT_WINDOW_HOST_LINUX_H_
 #pragma once
 
 #include <X11/Xlib.h>
 
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
 #undef RootWindow
 
+#include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "ui/aura/root_window_host.h"
 #include "ui/gfx/rect.h"
 
 namespace aura {
 
-class RootWindowHostLinux : public RootWindowHost {
+class RootWindowHostLinux : public RootWindowHost,
+                            public MessageLoop::Dispatcher {
  public:
   explicit RootWindowHostLinux(const gfx::Rect& bounds);
   virtual ~RootWindowHostLinux();
 
-  // Handles an event targeted at this host's window.
-  base::MessagePumpDispatcher::DispatchStatus Dispatch(XEvent* xev);
+  // Overridden from Dispatcher overrides:
+  virtual base::MessagePumpDispatcher::DispatchStatus
+      Dispatch(XEvent* xev) OVERRIDE;
 
  private:
   // RootWindowHost Overrides.
   virtual void SetRootWindow(RootWindow* root_window) OVERRIDE;
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void ToggleFullScreen() OVERRIDE;
   virtual gfx::Rect GetBounds() const OVERRIDE;
   virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE;
   virtual gfx::Point GetLocationOnNativeScreen() const OVERRIDE;
@@ skipping 34 matching lines @@
 
   // The invisible cursor.
   ::Cursor invisible_cursor_;
 
   // The bounds of |xwindow_|.
   gfx::Rect bounds_;
 
   // True if the window should be focused when the window is shown.
   bool focus_when_shown_;
 
+  scoped_array<XID> pointer_barriers_;
+
   DISALLOW_COPY_AND_ASSIGN(RootWindowHostLinux);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_HOST_LINUX_H_