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 134578)
+++ 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 root window you can use to parent a window. Note that in some
+// cases we create child windows not parented to its final container so in
+// those very few cases you should pass true in |is_child_window|.
+UI_EXPORT HWND GetRootWindow(bool is_child_window);

[sky, 2012/05/01 15:40:39]

Is there another name we could use for this? RootWindow is also the name of a
class aura.

[cpu_(ooo_6.6-7.5), 2012/05/01 20:53:12]

Yeah, I noticed. Does not seem to conflict because of namespaces, but I see it
can be confusing. That is why I renamed from RootWindow to GetRootWindow.

How about 
GetOSRootWindow?

GetTopLevelWindow, the other choice is used in  src/remoting/host

Naming is hard.

+
 }  // namespace ui
 
 #endif  // UI_BASE_WIN_HWND_UTIL_H_