cros: Allow JS to control virtual keyboard on sign-in screen.

ui/login/display_manager.js

 // 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.
 
 /**
  * @fileoverview Display manager for WebUI OOBE and login.
  */
 
 // TODO(xiyuan): Find a better to share those constants.
 /** @const */ var SCREEN_OOBE_NETWORK = 'connect';
@@ skipping 249 matching lines @@
      * @param {boolean} hidden Whether header is hidden.
      */
     get headerHidden() {
       return $('login-header-bar').hidden;
     },
 
     set headerHidden(hidden) {
       $('login-header-bar').hidden = hidden;
     },
 
-    set pinHidden(hidden) {
-      this.virtualKeyboardShown = hidden;
-      $('pod-row').setFocusedPodPinVisibility(!hidden);
-    },
-
     /**
      * Sets the current size of the client area (display size).
      * @param {number} width client area width
      * @param {number} height client area height
      */
     setClientAreaSize: function(width, height) {
       var clientArea = $('outer-container');
       var bottom = parseInt(window.getComputedStyle(clientArea).bottom);
       clientArea.style.minHeight = cr.ui.toCssPx(height - bottom);
     },
@@ skipping 783 matching lines @@
    */
   DisplayManager.refocusCurrentPod = function() {
     $('pod-row').refocusCurrentPod();
   };
 
   // Export
   return {
     DisplayManager: DisplayManager
   };
 });