Added Ash.SystemMenu.DefaultView.VisibleItems histogram.

ash/common/system/user/tray_user.cc

 // Copyright (c) 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.
 
 #include "ash/common/system/user/tray_user.h"
 
 #include "ash/common/ash_switches.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/system/tray/system_tray.h"
@@ skipping 20 matching lines @@
 
 namespace {
 
 const int kUserLabelToIconPadding = 5;
 
 }  // namespace
 
 namespace ash {
 
 TrayUser::TrayUser(SystemTray* system_tray, UserIndex index)
-    : SystemTrayItem(system_tray),
+    : SystemTrayItem(system_tray, UMA_USER),
       user_index_(index),
       user_(nullptr),
       layout_view_(nullptr),
       avatar_(nullptr),
       label_(nullptr) {
   WmShell::Get()->system_tray_notifier()->AddUserObserver(this);
 }
 
 TrayUser::~TrayUser() {
   WmShell::Get()->system_tray_notifier()->RemoveUserObserver(this);
@@ skipping 210 matching lines @@
   // Unit tests might come here with no images for some users.
   if (avatar_->size().IsEmpty())
     avatar_->SetSize(gfx::Size(kTrayItemSize, kTrayItemSize));
 }
 
 void TrayUser::UpdateLayoutOfItem() {
   UpdateAfterShelfAlignmentChange(system_tray()->shelf_alignment());
 }
 
 }  // namespace ash