MD Settings: Implement search URLs.

chrome/test/data/webui/settings/settings_ui_browsertest.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.
 
 /** @fileoverview Suite of tests for the Settings layout. */
 
 GEN_INCLUDE(['settings_page_browsertest.js']);
 
 /**
  * @constructor
@@ skipping 93 matching lines @@
       assertTrue(menu.advancedOpened);
 
       MockInteractions.tap(menu.$$('#advancedPage .menu-trigger'));
       Polymer.dom.flush();
 
       // Check that all values are updated in unison.
       assertFalse(menu.advancedOpened);
       assertFalse(ui.advancedOpened_);
       assertFalse(main.advancedToggleExpanded);
     });
+
+    test('URL initiated search propagates to search box', function() {
+      toolbar = /** @type {!CrToolbarElement} */ (ui.$$('cr-toolbar'));
+      var searchField = /** @type {CrToolbarSearchFieldElement} */ (
+          toolbar.getSearchField());
+
+      var query = 'foo';
+      settings.navigateTo(
+          settings.Route.BASIC, new URLSearchParams(`search=${query}`));
+      assertEquals(query, searchField.getSearchInput().bindValue);
+
+      settings.navigateTo(settings.Route.BASIC);
+      assertEquals('', searchField.getSearchInput().bindValue);
+    });
+
+    test('search box initiated search propagates to URL', function() {
+      assertFalse(settings.getQueryParameters().has('search'));
+      var searchField = /** @type {CrToolbarSearchFieldElement} */ (
+          toolbar.getSearchField());
+      var value = 'GOOG';
+      searchField.setValue(value);
+      assertEquals(value, settings.getQueryParameters().get('search'));
+    });
   });
 
   mocha.run();
 });