Use check item for side tab menu.

chrome/browser/views/toolbar_view.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/browser/views/toolbar_view.h"
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "chrome/app/chrome_dll_resource.h"
 #include "chrome/browser/browser.h"
@@ skipping 346 matching lines @@
     }
   } else if (type == NotificationType::UPGRADE_RECOMMENDED) {
     ShowUpgradeReminder();
   }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // ToolbarView, menus::SimpleMenuModel::Delegate implementation:
 
 bool ToolbarView::IsCommandIdChecked(int command_id) const {
+#if defined(OS_CHROMEOS)
+  if (command_id == IDC_TOGGLE_VERTICAL_TABS) {
+    return browser_->UseVerticalTabs();
+  }
+#endif
   return (command_id == IDC_SHOW_BOOKMARK_BAR) &&
       profile_->GetPrefs()->GetBoolean(prefs::kShowBookmarkBar);
 }
 
 bool ToolbarView::IsCommandIdEnabled(int command_id) const {
   return browser_->command_updater()->IsCommandEnabled(command_id);
 }
 
 bool ToolbarView::GetAcceleratorForCommandId(int command_id,
     menus::Accelerator* accelerator) {
@@ skipping 305 matching lines @@
   }
 #endif
 
   // Tell the menu button to activate, opening its pop-up menu.
   menu_button->Activate();
 
 #if defined(OS_WIN)
   SetToolbarFocus(NULL, menu_button);
 #endif
 }