Settings Rewrite: Fix Opening Sync User login

chrome/browser/resources/settings/people_page/sync_private_api.js

 // Copyright 2015 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.exportPath('settings');
 
 /**
  * The state of sync. This is the data structure sent back and forth between
  * C++ and JS. Its naming and structure is not optimal, but changing it would
  * require changes to the C++ handler, which is already functional.
@@ skipping 138 matching lines @@
     chrome.send('setProfileIconAndName', [iconUrl, name]);
   };
 </if>
 
   /**
    * Starts the signin process for the user. Does nothing if the user is
    * already signed in.
    * @private
    */
   SyncPrivateApi.startSignIn = function() {
-    chrome.send('SyncSetupStartSignIn');
+    // TODO(tommycli): Currently this is always false, but this will become
+    // a parameter once supervised users are implemented in MD Settings.
+    var creatingSupervisedUser = false;
+    chrome.send('SyncSetupStartSignIn', [creatingSupervisedUser]);
   };
 
   /**
    * Disconnects the signed in user.
    * @param {!boolean} deleteProfile
    * @private
    */
   SyncPrivateApi.disconnect = function(deleteProfile) {
     chrome.send('SyncSetupStopSyncing', [deleteProfile]);
   };
@@ skipping 115 matching lines @@
         break;
       default:
         // Other statuses (i.e. "spinner") are ignored.
     }
   };
 
   return {
     SyncPrivateApi: SyncPrivateApi,
   };
 });