Fix two container issues for new login screen

chrome/browser/resources/chromeos/login/md_login_shared.js

Index: chrome/browser/resources/chromeos/login/md_login_shared.js
diff --git a/chrome/browser/resources/chromeos/login/md_login_shared.js b/chrome/browser/resources/chromeos/login/md_login_shared.js
index 41afbaa4a8c70c61843a57258b65c7a0c7c89024..195102d869997e2a1e45f6959bf2d330da7c3aa4 100644
--- a/chrome/browser/resources/chromeos/login/md_login_shared.js
+++ b/chrome/browser/resources/chromeos/login/md_login_shared.js
@@ -425,6 +425,12 @@ cr.define('cr.ui', function() {
   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';
   };
 
   /**