MD Settings: indicate extension controlled search engines

chrome/test/data/webui/settings/search_engines_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_engines_page', function() {
   /**
    * @param {boolean} canBeDefault
    * @param {boolean} canBeEdited
    * @param {boolean} canBeRemoved
    * @return {!SearchEngine}
@@ skipping 238 matching lines @@
       });
 
       test('MakeDefault_Disabled', function() {
         testButtonDisabled(
             createSampleSearchEngine(false, true, true), 'makeDefault');
       });
 
       test('Edit_Disabled', function() {
         testButtonDisabled(createSampleSearchEngine(true, false, true), 'edit');
       });
+
+      test('All_Disabled', function() {
+        entry.engine = createSampleSearchEngine(true, false, false);
+        Polymer.dom.flush();
+        assertTrue(entry.hasAttribute('show-dots_'));
+
+        entry.engine = createSampleSearchEngine(false, false, false);
+        Polymer.dom.flush();
+        assertFalse(entry.hasAttribute('show-dots_'));
+      });
     });
   }
 
   function registerPageTests() {
     suite('SearchEnginePageTests', function() {
       /** @type {?SettingsSearchEnginesPageElement} */
       var page = null;
 
       var browserProxy = null;
 
@@ skipping 104 matching lines @@
 
   return {
     registerTests: function() {
       registerDialogTests();
       registerSearchEngineEntryTests();
       registerOmniboxExtensionEntryTests();
       registerPageTests();
     },
   };
 });