Disable extended desktop.

ui/aura/root_window_host_linux.cc

 // 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.
 
 #include "ui/aura/root_window_host_linux.h"
 
 #include <X11/cursorfont.h>
 #include <X11/extensions/Xfixes.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/extensions/Xrandr.h>
@@ skipping 479 matching lines @@
       // Always update barrier and mouse location because |bounds_| might
       // have already been updated in |SetBounds|.
       if (pointer_barriers_.get()) {
         UnConfineCursor();
         RootWindow* root = delegate_->AsRootWindow();
         client::ScreenPositionClient* client =
             client::GetScreenPositionClient(root);
         if (client) {
           gfx::Point p = gfx::Screen::GetCursorScreenPoint();
           client->ConvertPointFromScreen(root, &p);
-          if (root->ContainsPoint(p)) {
+          // TODO(oshima): Make sure the pointer is on one of root windows.
+          if (root->ContainsPoint(p))
             root->ConvertPointToNativeScreen(&p);
-            XWarpPointer(
-                xdisplay_, None, x_root_window_, 0, 0, 0, 0, p.x(), p.y());
-          }
+          else
+            p.SetPoint(0, 0);
+          XWarpPointer(
+              xdisplay_, None, x_root_window_, 0, 0, 0, 0, p.x(), p.y());
         }
         ConfineCursorToRootWindow();
       }
       if (size_changed)
         delegate_->OnHostResized(bounds.size());
       if (origin_changed)
         delegate_->OnHostMoved(bounds_.origin());
       break;
     }
     case GenericEvent:
@@ skipping 502 matching lines @@
       ui::ViewProp::GetValue(accelerated_widget, kRootWindowHostLinuxKey));
 }
 
 // static
 gfx::Size RootWindowHost::GetNativeScreenSize() {
   ::Display* xdisplay = base::MessagePumpAuraX11::GetDefaultXDisplay();
   return gfx::Size(DisplayWidth(xdisplay, 0), DisplayHeight(xdisplay, 0));
 }
 
 }  // namespace aura