md-settings: wrap lock screen dialogs in dom-if.

chrome/test/data/webui/settings/quick_unlock_authenticate_browsertest_chromeos.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.
 
 cr.define('settings_people_page_quick_unlock', function() {
   var element = null;
   var quickUnlockPrivateApi = null;
   var QuickUnlockMode = chrome.quickUnlockPrivate.QuickUnlockMode;
   var fakeUma = null;
 
@@ skipping 287 matching lines @@
         assertEquals(0, fakeUma.getHistogramValue(
             LockScreenProgress.CHOOSE_PIN_OR_PASSWORD));
         assertRadioButtonActive(passwordRadioButton);
 
         MockInteractions.tap(pinPasswordRadioButton);
         assertTrue(isSetupPinButtonVisible());
         assertRadioButtonActive(pinPasswordRadioButton)
 
         Polymer.dom.flush();
         MockInteractions.tap(getFromElement('#setupPinButton'));
+        Polymer.dom.flush();
         var setupPinDialog = getFromElement('#setupPin');
-        assertTrue(setupPinDialog.$.dialog.open);
+        assertTrue(setupPinDialog.$$('#dialog').open);
         assertEquals(1, fakeUma.getHistogramValue(
             LockScreenProgress.CHOOSE_PIN_OR_PASSWORD));
       });
     });
   }
 
   function registerSetupPinDialogTests() {
     suite('setup-pin-dialog', function() {
       var titleDiv = null;
       var problemDiv = null;
@@ skipping 10 matching lines @@
         // Create setup-pin element.
         element = document.createElement('settings-setup-pin-dialog');
         element.quickUnlockPrivate_ = quickUnlockPrivateApi;
         element.setModes =
             quickUnlockPrivateApi.setModes.bind(quickUnlockPrivateApi, '');
         element.writeUma_ = fakeUma.recordProgress.bind(fakeUma);
 
         document.body.appendChild(element);
         Polymer.dom.flush();
 
-        element.open();
-
         titleDiv = getFromElement('div[class="title"]');
         problemDiv = getFromElement('#problemDiv');
         pinKeyboard = getFromElement('pin-keyboard');
         backButton = getFromElement('paper-button[class="cancel-button"]');
         continueButton = getFromElement('paper-button[class="action-button"]');
 
         assertTrue(isVisible(backButton));
         assertTrue(isVisible(continueButton));
       });
 
@@ skipping 89 matching lines @@
         assertHasClass(problemDiv, 'error');
 
         // Changing the PIN changes the error to a warning.
         pinKeyboard.value = '111';
         assertHasClass(problemDiv, 'warning');
       });
 
       // Hitting cancel at the setup step dismisses the dialog.
       test('HittingBackButtonResetsState', function() {
         MockInteractions.tap(backButton);
-        assertFalse(element.$.dialog.open);
+        assertFalse(element.$$('#dialog').open);
       });
 
       // Hitting cancel at the confirm step dismisses the dialog.
       test('HittingBackButtonResetsState', function() {
         pinKeyboard.value = '1111';
         MockInteractions.tap(continueButton);
         MockInteractions.tap(backButton);
-        assertFalse(element.$.dialog.open);
+        assertFalse(element.$$('#dialog').open);
       });
 
       // User has to re-enter PIN for confirm step.
       test('PinKeyboardIsResetForConfirmStep', function() {
         pinKeyboard.value = '1111';
         MockInteractions.tap(continueButton);
         assertEquals('', pinKeyboard.value);
       });
 
       // Completing the flow results in a call to the quick unlock private API.
@@ skipping 20 matching lines @@
       });
     });
   }
 
   return {
     registerAuthenticateTests: registerAuthenticateTests,
     registerLockScreenTests: registerLockScreenTests,
     registerSetupPinDialogTests: registerSetupPinDialogTests
   };
 });