MD Settings: add empty list message for spell-check edit page.

chrome/test/data/webui/settings/fake_language_settings_private.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 Fake implementation of chrome.languageSettingsPrivate
  * for testing.
  */
 cr.define('settings', function() {
   /**
    * Returns a function that calls assertNotReached with the given name.
    * Necessary to include the callee in the stack trace.
    * @param {string} name
    * @return {function()}
    */
   function wrapAssertNotReached(name) {
     return function() {
       assertNotReached('Not implemented in fake: ' + name);
     };
   }
 
   /**
    * Fake of the chrome.languageSettingsPrivate API.
    * @constructor
+   * @extends {TestBrowserProxy}
    * @implements {LanguageSettingsPrivate}
    */
   function FakeLanguageSettingsPrivate() {
+    // List of method names expected to be tested with whenCalled()
+    settings.TestBrowserProxy.call(this, [
+      'getSpellcheckWords',
+    ]);
+
     /** @type {!Array<!chrome.languageSettingsPrivate.Language>} */
     this.languages = [{
       // English and some variants.
       code: 'en',
       displayName: 'English',
       nativeDisplayName: 'English',
       supportsTranslate: true,
     }, {
       code: 'en-CA',
       displayName: 'English (Canada)',
@@ skipping 54 matching lines @@
       enabled: false,
     }, {
       id: '_comp_ime_abcdefghijklmnopqrstuvwxyzabcdefxkb:us:sw',
       displayName: 'US Swahili keyboard',
       languageCodes: ['en', 'en-US', 'sw'],
       enabled: false,
     }];
   }
 
   FakeLanguageSettingsPrivate.prototype = {
+    __proto__: settings.TestBrowserProxy.prototype,
     // Methods for use in testing.
 
     /** @param {SettingsPrefsElement} */
     setSettingsPrefs: function(settingsPrefs) {
       this.settingsPrefs_ = settingsPrefs;
     },
 
     // LanguageSettingsPrivate fake.
 
     /**
@@ skipping 53 matching lines @@
      *     !chrome.languageSettingsPrivate.SpellcheckDictionaryStatus>):void}
      *     callback
      */
     getSpellcheckDictionaryStatuses:
         wrapAssertNotReached('getSpellcheckDictionaryStatuses'),
 
     /**
      * Gets the custom spell check words, in sorted order.
      * @param {function(!Array<string>):void} callback
      */
-    getSpellcheckWords: wrapAssertNotReached('getSpellcheckWords'),
+    getSpellcheckWords: function(callback) {
+      callback([]);
+      this.methodCalled('getSpellcheckWords');
+    },
 
     /**
      * Adds a word to the custom dictionary.
      * @param {string} word
      */
-    addSpellcheckWord: wrapAssertNotReached('addSpellcheckWord'),
+    addSpellcheckWord: function(word) {
+      // Current tests don't actually care about this implementation.
+    },
 
     /**
      * Removes a word from the custom dictionary.
      * @param {string} word
      */
     removeSpellcheckWord: wrapAssertNotReached('removeSpellcheckWord'),
 
     /**
      * Gets the translate target language (in most cases, the display locale).
      * @param {function(string):void} callback
@@ skipping 76 matching lines @@
 
     /**
      * Called when an input method is removed.
      * @type {!ChromeEvent}
      */
     onInputMethodRemoved: new FakeChromeEvent(),
   };
 
   return {FakeLanguageSettingsPrivate: FakeLanguageSettingsPrivate};
 });