MD Settings: Allow search within settings to track multiple requests separately.

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 80 matching lines @@
         // highlights are cleared.
         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 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>
+           <settings-section hidden-by-search>
+             <div><span>Nothing</span></div>
+           </settings-section>`;
+
+      var sections = Array.prototype.slice.call(
+          document.querySelectorAll('settings-section'));
+
+      return Promise.all(
+        sections.map(function(section) {
+          return searchManager.search('there', section);
+        }),
+      ).then(function(requests) {
+        assertTrue(requests[0].didFindMatches());
+        assertFalse(sections[0].hiddenBySearch);
+        assertTrue(requests[1].didFindMatches());
+        assertFalse(sections[1].hiddenBySearch);
+        assertFalse(requests[2].didFindMatches());
+        assertTrue(sections[2].hiddenBySearch);
+      });
+    });
   });
 });