MD Settings: Don't search inside <dialog> elements.

chrome/test/data/webui/settings/search_settings_test.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_test', function() {
 
   suite('SearchSettingsTest', function() {
     var searchManager;
 
     // Don't import script if already imported (happens in Vulcanized mode).
@@ skipping 81 matching lines @@
         return searchManager.search('', section);
       }).then(function() {
         var options = select.querySelectorAll('option');
         assertEquals(3, options.length);
         assertEquals('Foo', options[0].textContent);
         assertEquals('Settings', options[1].textContent);
         assertEquals('Baz', options[2].textContent);
       });
     });
 
+    test('ignored elements are ignored', function() {
+      var text = 'hello';
+      document.body.innerHTML =
+          `<settings-section hidden-by-search>
+             <cr-events>${text}</cr-events>
+             <dialog>${text}</dialog>
+             <iron-icon>${text}</iron-icon>
+             <iron-list>${text}</iron-list>
+             <paper-icon-button>${text}</paper-icon-button>
+             <paper-ripple>${text}</paper-ripple>
+             <paper-slider>${text}</paper-slider>
+             <paper-spinner>${text}</paper-spinner>
+             <style>${text}</style>
+             <template>${text}</template>
+           </settings-section>`;
+
+      var section = document.querySelector('settings-section');
+      assertTrue(section.hiddenBySearch);
+
+      return searchManager.search(text, section).then(function() {
+        assertTrue(section.hiddenBySearch);
+      });
+    });
+
     // Test that multiple requests for the same text correctly highlight their
     // corresponding part of the tree without affecting other parts of the tree.
     test('multiple simultaneous requests for the same text', function() {
       document.body.innerHTML =
           `<settings-section hidden-by-search>
              <div><span>Hello there</span></div>
            </settings-section>
            <settings-section hidden-by-search>
              <div><span>Hello over there</span></div>
            </settings-section>
@@ skipping 12 matching lines @@
         assertTrue(requests[0].didFindMatches());
         assertFalse(sections[0].hiddenBySearch);
         assertTrue(requests[1].didFindMatches());
         assertFalse(sections[1].hiddenBySearch);
         assertFalse(requests[2].didFindMatches());
         assertTrue(sections[2].hiddenBySearch);
       });
     });
   });
 });