Show warning message when trying to create SU with existing name

chrome/browser/resources/options/manage_profile_overlay.js

 // 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.
 
 cr.define('options', function() {
   var Page = cr.ui.pageManager.Page;
   var PageManager = cr.ui.pageManager.PageManager;
   var ArrayDataModel = cr.ui.ArrayDataModel;
 
   /**
@@ skipping 361 matching lines @@
      */
     receiveExistingSupervisedUsers_: function(supervisedUsers) {
       $('import-existing-supervised-user-link').hidden =
           supervisedUsers.length === 0;
       if (!$('create-profile-supervised').checked)
         return;
 
       var newName = $('create-profile-name').value;
       var i;
       for (i = 0; i < supervisedUsers.length; ++i) {
-        if (supervisedUsers[i].name == newName &&
-            !supervisedUsers[i].onCurrentDevice) {
-          var errorHtml = loadTimeData.getStringF(
-              'manageProfilesExistingSupervisedUser',
-              HTMLEscape(elide(newName, /* maxLength */ 50)));
-          this.showErrorBubble_(errorHtml, 'create', true);
+        if (supervisedUsers[i].name != newName)
+          continue;
+        // Check if another supervised user also exists with that name.
+        var nameIsUnique = true;
+        // Handling the case when multiple supervised users with the same
+        // name exist, but not all of them are on the device.
+        // If at least one is not imported, we want to offer that
+        // option to the user. This could happen due to a bug that allowed
+        // creating SUs with the same name (https://crbug.com/557445).
+        var allOnCurrentDevice = supervisedUsers[i].onCurrentDevice;
+        var j;
+        for (j = i + 1; j < supervisedUsers.length; ++j) {
+          if (supervisedUsers[j].name == newName) {
+            nameIsUnique = false;
+            allOnCurrentDevice = allOnCurrentDevice &&
+               supervisedUsers[j].onCurrentDevice;
+          }
+        }
 
-          // Check if another supervised user also exists with that name.
-          var nameIsUnique = true;
-          var j;
-          for (j = i + 1; j < supervisedUsers.length; ++j) {
-            if (supervisedUsers[j].name == newName) {
-              nameIsUnique = false;
-              break;
-            }
-          }
-          $('supervised-user-import-existing').onclick =
-              this.getImportHandler_(supervisedUsers[i], nameIsUnique);
-          $('create-profile-ok').disabled = true;
-          return;
-        }
+        var errorHtml = allOnCurrentDevice ?
+            loadTimeData.getStringF(
+                'managedProfilesExistingLocalSupervisedUser') :
+            loadTimeData.getStringF(
+                'manageProfilesExistingSupervisedUser',
+                HTMLEscape(elide(newName, /* maxLength */ 50)));
+        this.showErrorBubble_(errorHtml, 'create', true);
+
+        $('supervised-user-import-existing').onclick =
+            this.getImportHandler_(supervisedUsers[i], nameIsUnique);
+        $('create-profile-ok').disabled = true;
+        return;
       }
     },
 
     /**
      * Called in case the request for the list of supervised users fails because
      * of a signin error.
      * @private
      */
     onSigninError_: function() {
       this.updateSignedInStatus(this.signedInEmail_, true);
@@ skipping 448 matching lines @@
     'updateSignedInStatus',
     'updateSupervisedUsersAllowed',
   ]);
 
   // Export
   return {
     ManageProfileOverlay: ManageProfileOverlay,
     CreateProfileOverlay: CreateProfileOverlay,
   };
 });