Small fixes for the lock screen md-settings page.

chrome/browser/resources/settings/people_page/setup_pin_dialog.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
  * 'settings-setup-pin-dialog' is the settings page for choosing a PIN.
  *
  * Example:
  *
@@ skipping 185 matching lines @@
   },
 
   /** @private */
   onPinSubmit_: function() {
     if (!this.isConfirmStep_) {
       if (this.isPinLongEnough_(this.pinKeyboardValue_)) {
         this.initialPin_ = this.pinKeyboardValue_;
         this.pinKeyboardValue_ = '';
         this.isConfirmStep_ = true;
         this.onPinChange_();
+        this.$.pinKeyboard.focus();
       }
     } else {
       // onPinSubmit_ gets called if the user hits enter on the PIN keyboard.
       // The PIN is not guaranteed to be valid in that case.
       if (!this.canSubmit_())
         return;
 
       function onSetModesCompleted(didSet) {
         if (!didSet) {
           console.error('Failed to update pin');
@@ skipping 35 matching lines @@
    * @private
    * @param {boolean} isConfirmStep
    * @return {string}
    */
   getContinueMessage_: function(isConfirmStep) {
     return this.i18n(isConfirmStep ? 'confirm' : 'configurePinContinueButton');
   },
 });
 
 })();