Fix two container issues for new login screen

chrome/browser/resources/chromeos/login/md_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 407 matching lines @@
   Oobe.showControlBar = function(show) {
     Oobe.getInstance().headerHidden = !show;
   };
 
   /**
    * Changes some UI which depends on the virtual keyboard being shown/hidden.
    */
   Oobe.setVirtualKeyboardShown = function(shown) {
     Oobe.getInstance().virtualKeyboardShown = shown;
     $('pod-row').setFocusedPodPinVisibility(!shown);
+    // The dark overlay should always have the same size with the larger one
+    // of the outer-container and the scroll-container.
+    if (shown)
+      $('login-shield').style.minHeight = $('outer-container').style.minHeight;
+    else
+      $('login-shield').style.minHeight = 'unset';
   };
 
   /**
    * 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 31 matching lines @@
       // readyForTesting even on failures, just to make test bots happy.
       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);
   };
 })();