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

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.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/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 
 #include <X11/extensions/shape.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xregion.h>
@@ skipping 147 matching lines @@
 }
 
 // static
 DesktopWindowTreeHostX11* DesktopWindowTreeHostX11::GetHostForXID(XID xid) {
   aura::WindowTreeHost* host =
       aura::WindowTreeHost::GetForAcceleratedWidget(xid);
   return host ? host->window()->GetProperty(kHostForRootWindow) : NULL;
 }
 
 // static
+bool DesktopWindowTreeHostX11::AnyHostHasCapture() {
+  return (!!g_current_capture);
+}
+
+// static
 std::vector<aura::Window*> DesktopWindowTreeHostX11::GetAllOpenWindows() {
   std::vector<aura::Window*> windows(open_windows().size());
   std::transform(open_windows().begin(),
                  open_windows().end(),
                  windows.begin(),
                  GetContentWindowForXID);
   return windows;
 }
 
 gfx::Rect DesktopWindowTreeHostX11::GetX11RootWindowBounds() const {
@@ skipping 1434 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme(window);
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeTheme::instance();
 }
 
 }  // namespace views