Allow adding user and launching guest mode when all profiles are lock while force sign in is enable…

chrome/browser/resources/md_user_manager/control_bar.js

 // Copyright 2016 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.
 
 /**
  * @fileoverview 'control-bar' is the horizontal bar at the bottom of the user
  * manager screen.
  */
  Polymer({
   is: 'control-bar',
@@ skipping 15 matching lines @@
     /**
      * True if 'Add Person' button is displayed.
      * @type {boolean}
      */
     showAddPerson: {
       type: Boolean,
       value: false
     },
 
     /** @private {!signin.ProfileBrowserProxy} */
-    browserProxy_: Object
+    browserProxy_: Object,
+
+    /**
+     * True if the force sign in policy is enabled.
+     * @private {boolean}
+     */
+    isForceSigninEnabled_: {
+      type: Boolean,
+      value: function() {
+        return loadTimeData.getBoolean('isForceSigninEnabled');
+      },
+    }
   },
 
   /** @override */
   created: function() {
     this.browserProxy_ = signin.ProfileBrowserProxyImpl.getInstance();
   },
 
   /**
    * Handler for 'Browse as Guest' button click event.
    * @param {!Event} event
    * @private
    */
   onLaunchGuestTap_: function(event) {
     this.browserProxy_.areAllProfilesLocked().then(
         function(allProfilesLocked) {
-          if (!allProfilesLocked) {
+          if (!allProfilesLocked || this.isForceSigninEnabled_) {
             this.browserProxy_.launchGuestUser();
           } else {
             document.querySelector('error-dialog').show(
                 this.i18n('browseAsGuestAllProfilesLockedError'));
           }
         }.bind(this));
   },
 
   /**
    * Handler for 'Add Person' button click event.
    * @param {!Event} event
    * @private
    */
   onAddUserTap_: function(event) {
     this.browserProxy_.areAllProfilesLocked().then(
         function(allProfilesLocked) {
-          if (!allProfilesLocked) {
+          if (!allProfilesLocked || this.isForceSigninEnabled_) {
             // Event is caught by user-manager-pages.
             this.fire('change-page', {page: 'create-user-page'});
           } else {
             document.querySelector('error-dialog').show(
                 this.i18n('addProfileAllProfilesLockedError'));
           }
         }.bind(this));
   }
 });