Makes it so that when a folder is open on the bookmark bar and the...

views/controls/menu/menu_delegate.h

Index: views/controls/menu/menu_delegate.h
===================================================================
--- views/controls/menu/menu_delegate.h	(revision 29776)
+++ views/controls/menu/menu_delegate.h	(working copy)
@@ -12,12 +12,13 @@
 #include "app/os_exchange_data.h"
 #include "base/logging.h"
 #include "views/controls/menu/controller.h"
+#include "views/controls/menu/menu_item_view.h"
 #include "views/event.h"
 
 namespace views {
 
 class DropTargetEvent;
-class MenuItemView;
+class MenuButton;
 
 // MenuDelegate --------------------------------------------------------------
 
@@ -180,6 +181,19 @@
   // Notification that the user has highlighted the specified item.
   virtual void SelectionChanged(MenuItemView* menu) {
   }
+
+  // If the user drags the mouse outside the bounds of the menu the delegate
+  // is queried for a sibling menu to show. If this returns non-null the
+  // current menu is hidden, and the menu returned from this method is shown.
+  //
+  // The delegate owns the returned menu, not the controller.
+  virtual MenuItemView* GetSiblingMenu(MenuItemView* menu,
+                                       const gfx::Point& screen_point,
+                                       MenuItemView::AnchorPosition* anchor,
+                                       bool* has_mnemonics,
+                                       MenuButton** button) {
+      return NULL;
+  }
 };
 
 }  // namespace views