Providing more information on why certain users can't be added to multi-profile

chrome/browser/chromeos/login/users/chrome_user_manager.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 "chrome/browser/chromeos/login/users/chrome_user_manager.h"
 
 #include <cstddef>
 #include <set>
 
 #include "ash/multi_profile_uma.h"
@@ skipping 193 matching lines @@
       if (check ==
           MultiProfileUserController::NOT_ALLOWED_PRIMARY_USER_POLICY_FORBIDS) {
         return user_manager::UserList();
       }
 
       // Users with a policy that prevents them being added to a session will be
       // shown in login UI but will be grayed out.
       // Same applies to owner account (see http://crbug.com/385034).
       if (check == MultiProfileUserController::ALLOWED ||
           check == MultiProfileUserController::NOT_ALLOWED_POLICY_FORBIDS ||
-          check == MultiProfileUserController::NOT_ALLOWED_OWNER_AS_SECONDARY) {
+          check == MultiProfileUserController::NOT_ALLOWED_OWNER_AS_SECONDARY ||
+          check ==
+              MultiProfileUserController::NOT_ALLOWED_POLICY_CERT_TAINTED) {
         result.push_back(*it);
       }
     }
   }
 
   return result;
 }
 
 user_manager::UserList ChromeUserManager::GetUnlockUsers() const {
   const user_manager::UserList& logged_in_users = GetLoggedInUsers();
@@ skipping 781 matching lines @@
     if ((users + GetUsersAdmittedForMultiProfile().size()) > 1)
       ash::MultiProfileUMA::RecordUserCount(users);
   }
 
   base::debug::SetCrashKeyValue(
       crash_keys::kNumberOfUsers,
       base::StringPrintf("%" PRIuS, GetLoggedInUsers().size()));
 }
 
 }  // namespace chromeos