Add metrics to all items in the 'wrench' menu

chrome/browser/ui/views/toolbar/wrench_menu.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_TOOLBAR_WRENCH_MENU_H_
 #define CHROME_BROWSER_UI_VIEWS_TOOLBAR_WRENCH_MENU_H_
 
 #include <map>
 #include <utility>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
+#include "base/time/time.h"
+#include "base/timer/elapsed_timer.h"
 #include "components/bookmarks/browser/base_bookmark_model_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/base/models/menu_model.h"
 #include "ui/views/controls/menu/menu_delegate.h"
 
 class BookmarkMenuDelegate;
 class Browser;
 class WrenchMenuObserver;
 
@@ skipping 154 matching lines @@
   // Used for managing "Recent tabs" menu items.
   scoped_ptr<RecentTabsMenuModelDelegate> recent_tabs_menu_model_delegate_;
 
   content::NotificationRegistrar registrar_;
 
   // The bit mask of RunFlags.
   const int run_flags_;
 
   ObserverList<WrenchMenuObserver> observer_list_;
 
+  // Records the time from when menu opens to when the user selects a menu item.
+  base::ElapsedTimer menu_opened_timer_;
+
   DISALLOW_COPY_AND_ASSIGN(WrenchMenu);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_WRENCH_MENU_H_