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

ash/system/user/user_view.cc

 // Copyright 2014 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/user/user_view.h"
 
 #include <algorithm>
 
 #include "ash/multi_profile_uma.h"
 #include "ash/popup_message.h"
@@ skipping 382 matching lines @@
 
   views::TrayBubbleView* bubble_view =
       owner_->system_tray()->GetSystemBubble()->bubble_view();
   int max_card_width =
       bubble_view->GetMaximumSize().width() -
       (2 * kTrayPopupPaddingHorizontal + kTrayPopupPaddingBetweenItems);
   if (logout_button_)
     max_card_width -= logout_button_->GetPreferredSize().width();
   user_card_view_ =
       new UserCardView(login, max_card_width, multiprofile_index_);
-  bool clickable = IsMultiProfileSupportedAndUserActive() ||
-                   IsMultiAccountSupportedAndUserActive();
+  // The entry is clickable when no system modal dialog is open and one of the
+  // multi user options is active.
+  bool clickable = !Shell::GetInstance()->IsSystemModalWindowOpen() &&
+                   (IsMultiProfileSupportedAndUserActive() ||
+                    IsMultiAccountSupportedAndUserActive());
   if (clickable) {
     // To allow the border to start before the icon, reduce the size before and
     // add an inset to the icon to get the spacing.
     if (!multiprofile_index_) {
       SetBorder(views::Border::CreateEmptyBorder(
           kTrayPopupUserCardVerticalPadding,
           kTrayPopupPaddingHorizontal - kTrayUserTileHoverBorderInset,
           kTrayPopupUserCardVerticalPadding,
           kTrayPopupPaddingHorizontal));
       user_card_view_->SetBorder(views::Border::CreateEmptyBorder(
@@ skipping 140 matching lines @@
   focus_manager_ = NULL;
   if (user_card_view_->GetFocusManager())
     user_card_view_->GetFocusManager()->ClearFocus();
   popup_message_.reset();
   mouse_watcher_.reset();
   add_menu_option_.reset();
 }
 
 }  // namespace tray
 }  // namespace ash