MD Settings: Use paper-dropdown-menu for search engines.

chrome/test/data/webui/settings/search_page_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_search_page', function() {
+  function generateSearchEngineInfo() {
+    var searchEngines0 = settings_search.createSampleSearchEngine(
+        true, false, false);
+    searchEngines0.default = true;
+    var searchEngines1 = settings_search.createSampleSearchEngine(
+        true, false, false);
+    searchEngines1.default = false;
+    var searchEngines2 = settings_search.createSampleSearchEngine(
+        true, false, false);
+    searchEngines2.default = false;
+
+    return {
+      defaults: [searchEngines0, searchEngines1, searchEngines2],
+      others: [],
+      extensions: [],
+    };
+  }
+
+  function registerTests() {
+    suite('SearchPageTests', function() {
+      /** @type {?SettingsSearchPageElement} */
+      var page = null;
+
+      var browserProxy = null;
+
+      setup(function() {
+        browserProxy = new settings_search.TestSearchEnginesBrowserProxy();
+        browserProxy.setSearchEnginesInfo(generateSearchEngineInfo());
+        settings.SearchEnginesBrowserProxyImpl.instance_ = browserProxy;
+        PolymerTest.clearBody();
+        page = document.createElement('settings-search-page');
+        document.body.appendChild(page);
+      });
+
+      teardown(function() { page.remove(); });
+
+      // Tests that the page is querying and displaying search engine info on
+      // startup.
+      test('Initialization', function() {
+        var listboxElement = page.$$('paper-listbox');
+
+        return browserProxy.whenCalled('getSearchEnginesList').then(function() {
+          assertEquals(0, listboxElement.selected);
+
+          // Simulate a user initiated change of the default search engine.
+          listboxElement.selected = 1;
+          return browserProxy.whenCalled('setDefaultSearchEngine');
+        }).then(function() {
+          assertEquals(1, listboxElement.selected);
+
+          // Simulate a change that happened in a different tab.
+          var searchEnginesInfo = generateSearchEngineInfo();
+          searchEnginesInfo.defaults[0].default = false;
+          searchEnginesInfo.defaults[1].default = false;
+          searchEnginesInfo.defaults[2].default = true;
+
+          browserProxy.resetResolver('setDefaultSearchEngine');
+          cr.webUIListenerCallback('search-engines-changed', searchEnginesInfo);
+          assertEquals(2, listboxElement.selected);
+
+          browserProxy.whenCalled('setDefaultSearchEngine').then(function() {
+            // Since the change happened in a different tab, there should be no
+            // new call to |setDefaultSearchEngine|.
+            assertNotReached('Should not call setDefaultSearchEngine again');
+          });
+        });
+      });
+    });
+  }
+
+  return {
+    registerTests: registerTests,
+  };
+});