Avoids releasing capture in EndMoveLoop if capture was switched to another window while dragging

ui/views/widget/desktop_aura/desktop_window_tree_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_WINDOW_TREE_HOST_X11_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_
 
 #include <X11/extensions/shape.h>
 #include <X11/Xlib.h>
 
@@ skipping 32 matching lines @@
       internal::NativeWidgetDelegate* native_widget_delegate,
       DesktopNativeWidgetAura* desktop_native_widget_aura);
   virtual ~DesktopWindowTreeHostX11();
 
   // A way of converting an X11 |xid| host window into a |content_window_|.
   static aura::Window* GetContentWindowForXID(XID xid);
 
   // A way of converting an X11 |xid| host window into this object.
   static DesktopWindowTreeHostX11* GetHostForXID(XID xid);
 
+  // Returns if any DesktopWindowTreeHostX11 instance has capture.
+  static bool AnyHostHasCapture();
+
   // Get all open top-level windows. This includes windows that may not be
   // visible. This list is sorted in their stacking order, i.e. the first window
   // is the topmost window.
   static std::vector<aura::Window*> GetAllOpenWindows();
 
   // Returns the current bounds in terms of the X11 Root Window.
   gfx::Rect GetX11RootWindowBounds() const;
 
   // Called by X11DesktopHandler to notify us that the native windowing system
   // has changed our activation.
@@ skipping 231 matching lines @@
   // attention to the window or completely ignore the hint. We stop flashing
   // the frame when |xwindow_| gains focus or handles a mouse button event.
   bool urgency_hint_set_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopWindowTreeHostX11);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_