linux-aura: Fix some dragging behaviour.

ui/views/widget/desktop_aura/desktop_root_window_host_x11.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_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_X11_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_X11_H_
 
 #include <X11/extensions/shape.h>
 #include <X11/Xlib.h>
 
@@ skipping 13 matching lines @@
 namespace gfx {
 class ImageSkia;
 class ImageSkiaRep;
 }
 
 namespace views {
 class DesktopDragDropClientAuraX11;
 class DesktopDispatcherClient;
 class DesktopRootWindowHostObserverX11;
 class X11DesktopWindowMoveClient;
+class X11ScopedCapture;
 class X11WindowEventFilter;
 
 class VIEWS_EXPORT DesktopRootWindowHostX11 :
     public DesktopRootWindowHost,
     public aura::RootWindowHost,
     public base::MessageLoop::Dispatcher {
  public:
   DesktopRootWindowHostX11(
       internal::NativeWidgetDelegate* native_widget_delegate,
       DesktopNativeWidgetAura* desktop_native_widget_aura);
@@ skipping 230 matching lines @@
   // like Windows SetCapture()/ReleaseCapture(), it is entirely implicit and
   // there are no notifications when this changes. We need to track this so we
   // can notify widgets when they have lost capture, which controls a bunch of
   // things in views like hiding menus.
   static DesktopRootWindowHostX11* g_current_capture;
 
   // A list of all (top-level) windows that have been created but not yet
   // destroyed.
   static std::list<XID>* open_windows_;
 
+  scoped_ptr<X11ScopedCapture> x11_capture_;
+
   string16 window_title_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopRootWindowHostX11);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_X11_H_