[win8] Force browsers created with Chrome in Metro mode to be on the Ash desktop.

chrome/browser/ui/browser_window.h

Index: chrome/browser/ui/browser_window.h
diff --git a/chrome/browser/ui/browser_window.h b/chrome/browser/ui/browser_window.h
index f9c66db0575346fc5a102fda36ff681163dd0117..efd519ab56d1e3aea8909d0ffb380e7bc270541f 100644
--- a/chrome/browser/ui/browser_window.h
+++ b/chrome/browser/ui/browser_window.h
@@ -348,6 +348,12 @@ class BrowserWindow : public ui::BaseWindow {
   // Construct a BrowserWindow implementation for the specified |browser|.
   static BrowserWindow* CreateBrowserWindow(Browser* browser);
 
+  // Returns a HostDesktopType that is compatible with the current Chrome window
+  // configuration. On Windows with Ash, this is always HOST_DESKTOP_TYPE_ASH
+  // while Chrome is running in Metro mode. Otherwise returns |desktop_type|.
+  static chrome::HostDesktopType AdjustHostDesktopType(
+      chrome::HostDesktopType desktop_type);
+
   // Shows the avatar bubble inside |web_contents|. The bubble is positioned
   // relative to |rect|. |rect| should be in the |web_contents| coordinate
   // system.