Fullscreen can't use the desktop as a parent in metro mode

ui/base/win/hwnd_util.h

Index: ui/base/win/hwnd_util.h
===================================================================
--- ui/base/win/hwnd_util.h	(revision 134777)
+++ ui/base/win/hwnd_util.h	(working copy)
@@ -47,6 +47,11 @@
 // user selected something.
 UI_EXPORT void ShowSystemMenu(HWND window, int screen_x, int screen_y);
 
+// Returns the window you can use to parent a top level window.
+// Note that in some cases we create child windows not parented to its final
+// container so in those cases you should pass true in |get_real_hwnd|.
+UI_EXPORT HWND GetWindowToParentTo(bool get_real_hwnd);
+
 }  // namespace ui
 
 #endif  // UI_BASE_WIN_HWND_UTIL_H_