Allow menus to stay open during a child view's drag and drop

ui/views/controls/menu/menu_delegate.cc

Index: ui/views/controls/menu/menu_delegate.cc
diff --git a/ui/views/controls/menu/menu_delegate.cc b/ui/views/controls/menu/menu_delegate.cc
index 0793e39b5334dc89b33a2ed05c6e64ec42a27e29..12e5a7481c80e6e43d00bb416dd85032d65f0c51 100644
--- a/ui/views/controls/menu/menu_delegate.cc
+++ b/ui/views/controls/menu/menu_delegate.cc
@@ -72,6 +72,10 @@ bool MenuDelegate::ShouldCloseAllMenusOnExecute(int id) {
   return true;
 }
 
+bool MenuDelegate::ShouldCloseOnDragComplete() {
+  return true;
+}
+
 void MenuDelegate::ExecuteCommand(int id, int mouse_event_flags) {
   ExecuteCommand(id);
 }