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

ui/base/win/hwnd_util.cc

Index: ui/base/win/hwnd_util.cc
===================================================================
--- ui/base/win/hwnd_util.cc	(revision 134578)
+++ ui/base/win/hwnd_util.cc	(working copy)
@@ -6,6 +6,7 @@
 
 #include "base/i18n/rtl.h"
 #include "base/string_util.h"
+#include "base/win/metro.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
@@ -181,4 +182,19 @@
     SendMessage(window, WM_SYSCOMMAND, command, 0);
 }
 
+extern "C" {
+  typedef HWND (*RootWindow)();
+}
+
+HWND GetRootWindow(bool is_child_window) {
+  HMODULE metro = base::win::GetMetroModule();
+  if (!metro) {

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

nit: no {}

+    return is_child_window ? ::GetDesktopWindow() : HWND_DESKTOP;
+  }
+  // In windows 8 metro-mode the root window is not the desktop.
+  RootWindow root_window =
+      reinterpret_cast<RootWindow>(::GetProcAddress(metro, "GetRootWindow"));
+  return root_window();
+}
+
 }  // namespace ui