Change to address default selection of menu item

ui/views/controls/menu/menu_runner.h

Index: ui/views/controls/menu/menu_runner.h
diff --git a/ui/views/controls/menu/menu_runner.h b/ui/views/controls/menu/menu_runner.h
index cbb380fbc5d9873e91f10b75bd64f8c85a22fa16..72d2efcc2e1f0f790dff2d8092c3fc8871f707fc 100644
--- a/ui/views/controls/menu/menu_runner.h
+++ b/ui/views/controls/menu/menu_runner.h
@@ -52,6 +52,10 @@ class VIEWS_EXPORT MenuRunner {
     // caller, instead the delegate is notified when the menu closes via the
     // DropMenuClosed method.
     FOR_DROP      = 1 << 2,
+
+    // The menu is a context menu (not necessarily nested), for example right
+    // click on a link on a website in the browser.
+    CONTEXT_MENU  = 1 << 3,
   };
 
   enum RunResult {