Add metrics to all items in the 'wrench' menu

chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.h

 // Copyright 2012 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_TOOLBAR_RECENT_TABS_SUB_MENU_MODEL_H_
 #define CHROME_BROWSER_UI_TOOLBAR_RECENT_TABS_SUB_MENU_MODEL_H_
 
 #include <set>
 
 #include "base/memory/weak_ptr.h"
 #include "base/task/cancelable_task_tracker.h"
+#include "base/timer/elapsed_timer.h"
 #include "chrome/browser/favicon/favicon_service.h"
 #include "chrome/browser/sessions/tab_restore_service.h"
 #include "chrome/browser/sessions/tab_restore_service_observer.h"
 #include "chrome/browser/sync/glue/synced_session.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/base/models/simple_menu_model.h"
 
 class Browser;
 
 namespace browser_sync {
@@ skipping 142 matching lines @@
   // menumodel.
   int last_local_model_index_;
 
   gfx::Image default_favicon_;
 
   base::CancelableTaskTracker local_tab_cancelable_task_tracker_;
   base::CancelableTaskTracker other_devices_tab_cancelable_task_tracker_;
 
   base::WeakPtrFactory<RecentTabsSubMenuModel> weak_ptr_factory_;
 
+  // Time the menu is open for until a recent tab is selected.
+  base::ElapsedTimer menu_opened_timer_;
+
   DISALLOW_COPY_AND_ASSIGN(RecentTabsSubMenuModel);
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_RECENT_TABS_SUB_MENU_MODEL_H_