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

chrome/browser/resources/chromeos/login/login_shared.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 Common OOBE controller methods. This method is shared between
  * OOBE, login, and the lock screen. Add only methods that need to be shared
  * between all *three* screens here, as each additional method increases the
  * time it takes to show the lock screen.
  *
@@ skipping 394 matching lines @@
   };
 
   /**
    * Shows/hides login UI control bar with buttons like [Shut down].
    */
   Oobe.showControlBar = function(show) {
     Oobe.getInstance().headerHidden = !show;
   };
 
   /**
    * Shows/hides pin keyboard on the lock screen.

[achuithb, 2017/04/12 19:00:26]

Also update comment

[jdufault, 2017/04/13 00:34:42]

Done.

    */
-  Oobe.showPinKeyboard = function(show) {
-    Oobe.getInstance().pinHidden = !show;
+  Oobe.setVirtualKeyboardShown = function(shown) {
+    Oobe.getInstance().virtualKeyboardShown = shown;
+    $('pod-row').setFocusedPodPinVisibility(!shown);
   };
 
   /**
    * Sets the current size of the client area (display size).
    * @param {number} width client area width
    * @param {number} height client area height
    */
   Oobe.setClientAreaSize = function(width, height) {
     Oobe.getInstance().setClientAreaSize(width, height);
   };
@@ skipping 22 matching lines @@
   document.addEventListener('DOMContentLoaded', function() {
     Oobe.initialize();
     Oobe.readyForTesting = true;
   });
 
   // Install a global error handler so stack traces are included in logs.
   window.onerror = function(message, file, line, column, error) {
     console.error(error.stack);
   }
 })();