ash: Add a unit test for the system update tray item

ash/system/tray/system_tray.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/system/tray/system_tray.h"
 
 #include "ash/ash_switches.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
@@ skipping 124 matching lines @@
 SystemTray::SystemTray(StatusAreaWidget* status_area_widget)
     : TrayBackgroundView(status_area_widget),
       items_(),
       detailed_item_(nullptr),
       default_bubble_height_(0),
       hide_notifications_(false),
       full_system_tray_menu_(false),
       tray_accessibility_(nullptr),
       tray_cast_(nullptr),
       tray_date_(nullptr),
+      tray_update_(nullptr),
       screen_capture_tray_item_(nullptr),
       screen_share_tray_item_(nullptr) {
   SetContentsBackground();
 }
 
 SystemTray::~SystemTray() {
   // Destroy any child views that might have back pointers before ~View().
   system_bubble_.reset();
   notification_bubble_.reset();
   for (std::vector<SystemTrayItem*>::iterator it = items_.begin();
@@ skipping 19 matching lines @@
 
   if (maximum_user_profiles > 1) {
     // Add a special double line separator between users and the rest of the
     // menu if more then one user is logged in.
     AddTrayItem(new TrayUserSeparator(this));
   }
 #endif
 
   tray_accessibility_ = new TrayAccessibility(this);
   tray_date_ = new TrayDate(this);
+  tray_update_ = new TrayUpdate(this);
 
 #if defined(OS_CHROMEOS)
   AddTrayItem(new TraySessionLengthLimit(this));
   AddTrayItem(new TrayEnterprise(this));
   AddTrayItem(new TraySupervisedUser(this));
   AddTrayItem(new TrayIME(this));
   AddTrayItem(tray_accessibility_);
   AddTrayItem(new TrayTracing(this));
   AddTrayItem(new TrayPower(this, message_center::MessageCenter::Get()));
   AddTrayItem(new TrayNetwork(this));
   AddTrayItem(new TrayVPN(this));
   AddTrayItem(new TraySms(this));
   AddTrayItem(new TrayBluetooth(this));
   tray_cast_ = new TrayCast(this);
   AddTrayItem(tray_cast_);
   AddTrayItem(new TrayDisplay(this));
   screen_capture_tray_item_ = new ScreenCaptureTrayItem(this);
   AddTrayItem(screen_capture_tray_item_);
   screen_share_tray_item_ = new ScreenShareTrayItem(this);
   AddTrayItem(screen_share_tray_item_);
   AddTrayItem(new MultiProfileMediaTrayItem(this));
   AddTrayItem(new TrayAudioChromeOs(this));
   AddTrayItem(new TrayBrightness(this));
   AddTrayItem(new TrayCapsLock(this));
   AddTrayItem(new TrayRotationLock(this));
   AddTrayItem(new TraySettings(this));
-  AddTrayItem(new TrayUpdate(this));
+  AddTrayItem(tray_update_);
   AddTrayItem(tray_date_);
 #elif defined(OS_WIN)
   AddTrayItem(tray_accessibility_);
   if (media::CoreAudioUtil::IsSupported())
     AddTrayItem(new TrayAudioWin(this));
-  AddTrayItem(new TrayUpdate(this));
+  AddTrayItem(tray_update_);
   AddTrayItem(tray_date_);
 #endif
 
   SetVisible(ash::WmShell::Get()
                  ->system_tray_delegate()
                  ->GetTrayVisibilityOnStartup());
 }
 
 void SystemTray::AddTrayItem(SystemTrayItem* item) {
   items_.push_back(item);
@@ skipping 475 matching lines @@
 views::View* SystemTray::GetTrayItemViewForTest(SystemTrayItem* item) {
   std::map<SystemTrayItem*, views::View*>::iterator it =
       tray_item_map_.find(item);
   return it == tray_item_map_.end() ? NULL : it->second;
 }
 
 TrayCast* SystemTray::GetTrayCastForTesting() const { return tray_cast_; }
 
 TrayDate* SystemTray::GetTrayDateForTesting() const { return tray_date_; }
 
+TrayUpdate* SystemTray::GetTrayUpdateForTesting() const {
+  return tray_update_;
+}
+
 bool SystemTray::PerformAction(const ui::Event& event) {
   // If we're already showing the default view, hide it; otherwise, show it
   // (and hide any popup that's currently shown).
   if (HasSystemBubbleType(SystemTrayBubble::BUBBLE_TYPE_DEFAULT)) {
     system_bubble_->bubble()->Close();
   } else {
     int arrow_offset = TrayBubbleView::InitParams::kArrowDefaultOffset;
     if (event.IsMouseEvent() || event.type() == ui::ET_GESTURE_TAP) {
       const ui::LocatedEvent& located_event =
           static_cast<const ui::LocatedEvent&>(event);
@@ skipping 37 matching lines @@
           .work_area()
           .height();
   if (work_area_height > 0) {
     UMA_HISTOGRAM_CUSTOM_COUNTS(
         "Ash.SystemMenu.PercentageOfWorkAreaHeightCoveredByMenu",
         100 * bubble_view->height() / work_area_height, 1, 300, 100);
   }
 }
 
 }  // namespace ash