Enable the PIN keyboard on the lockscreen.

ui/login/account_picker/screen_account_picker.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 Account picker screen implementation.
  */
 
 login.createScreen('AccountPickerScreen', 'account-picker', function() {
   /**
@@ skipping 10 matching lines @@
       'setApps',
       'setShouldShowApps',
       'showAppError',
       'updateUserImage',
       'setCapsLockState',
       'forceLockedUserPodFocus',
       'removeUser',
       'showBannerMessage',
       'showUserPodCustomIcon',
       'hideUserPodCustomIcon',
+      'disablePinKeyboardForUser',
       'setAuthType',
       'setTouchViewState',
       'setPublicSessionDisplayName',
       'setPublicSessionLocales',
       'setPublicSessionKeyboardLayouts',
     ],
 
     preferredWidth_: 0,
     preferredHeight_: 0,
 
@@ skipping 148 matching lines @@
         if (maxHeight < $('bubble').offsetHeight) {
           $('bubble').showContentForElement(activatedPod.mainInput,
                                             cr.ui.Bubble.Attachment.TOP,
                                             error,
                                             BUBBLE_OFFSET, BUBBLE_PADDING);
         }
       }
     },
 
     /**
+     * Loads the PIN keyboard if any of the users can login with a PIN.
+     * @param {array} users Array of user instances.
+     */
+    loadPinKeyboardIfNeeded_: function(users) {
+      for (var i = 0; i < users.length; ++i) {
+        var user = users[i];
+        if (user.showPin) {
+          showPinKeyboardAsync();
+          return;
+        }
+      }
+    },
+
+    /**
      * Loads given users in pod row.
      * @param {array} users Array of user.
      * @param {boolean} showGuest Whether to show guest session button.
      */
     loadUsers: function(users, showGuest) {
+      this.loadPinKeyboardIfNeeded_(users);
+
       $('pod-row').loadPods(users);
       $('login-header-bar').showGuestButton = showGuest;
       // On Desktop, #login-header-bar has a shadow if there are 8+ profiles.
       if (Oobe.getInstance().displayType == DISPLAY_TYPE.DESKTOP_USER_MANAGER)
         $('login-header-bar').classList.toggle('shadow', users.length > 8);
     },
 
     /**
      * Runs app with a given id from the list of loaded apps.
      * @param {!string} app_id of an app to run.
@@ skipping 117 matching lines @@
 
     /**
      * Sets the state of touch view mode.
      * @param {boolean} isTouchViewEnabled true if the mode is on.
      */
     setTouchViewState: function(isTouchViewEnabled) {
       $('pod-row').setTouchViewState(isTouchViewEnabled);
     },
 
     /**
+     * Hides the PIN keyboard if it's active.
+     * @param {!user} user The user who can no longer enter a PIN.
+     */
+    disablePinKeyboardForUser: function(user) {
+      var pinContainer = $('pin-container');
+
+      // Transition opacity to 0, and when the transition is done hide the
+      // keyboard so it doesn't take layout space.
+      pinContainer.style.opacity = 0;
+      pinContainer.addEventListener('webkitTransitionEnd', function f(e) {
+        pinContainer.removeEventListener('webkitTransitionEnd', f);
+        pinContainer.hidden = true;
+      });
+      ensureTransitionEndEvent(pinContainer);
+    },
+
+    /**
      * Updates the display name shown on a public session pod.
      * @param {string} userID The user ID of the public session
      * @param {string} displayName The new display name
      */
     setPublicSessionDisplayName: function(userID, displayName) {
       $('pod-row').setPublicSessionDisplayName(userID, displayName);
     },
 
     /**
      * Updates the list of locales available for a public session.
@@ skipping 18 matching lines @@
      * @param {string} userID The user ID of the public session
      * @param {string} locale The locale to which this list of keyboard layouts
      *     applies
      * @param {!Object} list List of available keyboard layouts
      */
     setPublicSessionKeyboardLayouts: function(userID, locale, list) {
       $('pod-row').setPublicSessionKeyboardLayouts(userID, locale, list);
     }
   };
 });