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

ui/login/account_picker/screen_account_picker.js

Index: ui/login/account_picker/screen_account_picker.js
diff --git a/ui/login/account_picker/screen_account_picker.js b/ui/login/account_picker/screen_account_picker.js
index 7cac00bc3a4131a61cced2d65def37864f3e96ef..5044a3d2e186d4ee30306cdb21ec6c09d80cd57f 100644
--- a/ui/login/account_picker/screen_account_picker.js
+++ b/ui/login/account_picker/screen_account_picker.js
@@ -266,6 +266,14 @@ login.createScreen('AccountPickerScreen', 'account-picker', function() {
      * @param {array} users Array of user instances.
      */
     initializePinKeyboardStateForUsers_: function(users) {
+      // It is possible that the PIN keyboard HTML has already been loaded. If
+      // that is the case, we want to show the user pods with the PIN keyboard
+      // immediately without running the PIN show/hide effect.
+      document.body.classList.add('disable-pin-animation');
+      setTimeout(function() {
+        document.body.classList.remove('disable-pin-animation');
+      });
+
       for (var i = 0; i < users.length; ++i) {
         var user = users[i];
         if (user.showPin) {