Added Ash.SystemMenu.DefaultView.VisibleItems histogram.

ash/common/system/user/tray_user_separator.cc

 // 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.
 
 #include "ash/common/system/user/tray_user_separator.h"
 
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/wm_shell.h"
 #include "ui/views/view.h"
 
 namespace ash {
 
 TrayUserSeparator::TrayUserSeparator(SystemTray* system_tray)
-    : SystemTrayItem(system_tray), separator_shown_(false) {}
+    : SystemTrayItem(system_tray, UMA_NOT_RECORDED), separator_shown_(false) {}
 
 views::View* TrayUserSeparator::CreateTrayView(LoginStatus status) {
   return NULL;
 }
 
 views::View* TrayUserSeparator::CreateDefaultView(LoginStatus status) {
   if (status == LoginStatus::NOT_LOGGED_IN)
     return NULL;
 
   const SessionStateDelegate* session_state_delegate =
@@ skipping 12 matching lines @@
 
 views::View* TrayUserSeparator::CreateDetailedView(LoginStatus status) {
   return NULL;
 }
 
 void TrayUserSeparator::DestroyDefaultView() {
   separator_shown_ = false;
 }
 
 }  // namespace ash