WebUI: cr-search-field, do not call delegate if search query did not change.

chrome/test/data/webui/cr_elements/cr_toolbar_search_field_tests.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 cr-toolbar-search-field. */
 cr.define('cr_toolbar_search_field', function() {
   function registerTests() {
     suite('cr-toolbar-search-field', function() {
       /** @type {?CrToolbarSearchFieldElement} */
       var field;
@@ skipping 54 matching lines @@
 
         MockInteractions.tap(field);
         assertEquals(field.$.searchInput, field.root.activeElement);
 
         MockInteractions.pressAndReleaseKeyOn(
             field.$.searchInput, 27, '', 'Escape');
         assertFalse(field.showingSearch, 'Pressing escape closes field.');
         assertNotEquals(field.$.searchInput, field.root.activeElement);
       });
 
-      test('passes searches correctly', function() {
+      test('notifies on new searches', function() {
         MockInteractions.tap(field);
-        simulateSearch('test');
-        assertEquals('test', field.getValue());
+        simulateSearch('query1');
+        assertEquals('query1', field.getValue());
 
         MockInteractions.tap(field.$.clearSearch);
         assertFalse(field.showingSearch);
         assertEquals('', field.getValue());
 
-        assertEquals(['test', ''].join(), delegate.searches.join());
+        simulateSearch('query2');
+        // Expecting identical query to be ignored.
+        simulateSearch('query2');
+
+        assertEquals(['query1', '', 'query2'].join(), delegate.searches.join());
       });
 
       test('blur does not close field when a search is active', function() {
         MockInteractions.tap(field);
         simulateSearch('test');
         MockInteractions.blur(field.$.searchInput);
 
         assertTrue(field.showingSearch);
       });
     });
   }
 
   return {
     registerTests: registerTests,
   };
 });