Multiprofile security: Show a warning messagebox when desktop casting/sharing is turned on upon user

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/metrics/user_metrics_recorder.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
@@ skipping 164 matching lines @@
   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));
   AddTrayItem(new TrayDisplay(this));
-  AddTrayItem(new ScreenCaptureTrayItem(this));
-  AddTrayItem(new ScreenShareTrayItem(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 TraySettings(this));
   AddTrayItem(new TrayUpdate(this));
   AddTrayItem(new TrayRotationLock(this));
   AddTrayItem(tray_date_);
 #elif defined(OS_WIN)
   AddTrayItem(tray_accessibility_);
@@ skipping 521 matching lines @@
   system_bubble_.reset();
   // When closing a system bubble with the alternate shelf layout, we need to
   // turn off the active tinting of the shelf.
   if (full_system_tray_menu_) {
     SetDrawBackgroundAsActive(false);
     full_system_tray_menu_ = false;
   }
 }
 
 }  // namespace ash