cros: HTML fixes needed to reinitializing an existing lock WebUI.

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

 // Copyright (c) 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 Login UI based on a stripped down OOBE controller.
  */
 
 <include src="login_shared.js">
 
@@ skipping 48 matching lines @@
     initialize: function() {
       cr.ui.login.DisplayManager.initialize();
       login.AccountPickerScreen.register();
 
       cr.ui.Bubble.decorate($('bubble'));
       login.HeaderBar.decorate($('login-header-bar'));
 
       chrome.send('screenStateInitialize');
     },
 
+    /**
+     * Notification from the host that the PIN keyboard will be used in the
+     * lock session so it should also get preloaded.
+     */
+    preloadPinKeyboard: function() {
+      showPinKeyboardAsync();
+    },
+
+    /**
+     * Called when a preloaded webview (this) instance is being reused to
+     * display a new lock screen session. This will also be called when a
+     * lock screen has been preloaded and is being displayed for the first
+     * time.
+     */
+    reload: function() {
+      // Sending accountPickerReady displays the webui. Wait for the next
+      // animation frame so the user does not see any state from the previous
+      // instance.
+      requestAnimationFrame(function() {
+        chrome.send('accountPickerReady');
+      });
+    },
+
+    /**
+     * Called when the lock screen has been dismissed but this webview will stay
+     * in memory. The webview will be reused when Oobe.reload() is called.
+     */
+    teardown: function() {
+      // The PIN keyboard will disable the virtual keyboard. Make sure to
+      // revert the force disable when hiding the lock screen.
+      chrome.send('setForceDisableVirtualKeyboard', [false]);
+    },
+
     // Dummy Oobe functions not present with stripped login UI.
     initializeA11yMenu: function(e) {},
     handleAccessibilityLinkClick: function(e) {},
     handleSpokenFeedbackClick: function(e) {},
     handleHighContrastClick: function(e) {},
     handleScreenMagnifierClick: function(e) {},
     setUsageStats: function(checked) {},
     setOemEulaUrl: function(oemEulaUrl) {},
     setTpmPassword: function(password) {},
     refreshA11yInfo: function(data) {},
 
     /**
      * Reloads content of the page.
      * @param {!Object} data New dictionary with i18n values.
      */
     reloadContent: function(data) {
       loadTimeData.overrideValues(data);
       i18nTemplate.process(document, loadTimeData);
       Oobe.getInstance().updateLocalizedContent_();
     },
   };
 });