Implement chrome.languageSettingsPrivate custom spell check functions

third_party/closure_compiler/externs/language_settings_private.js

 // Copyright 2015 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.
 
 // This file was generated by:
 //   tools/json_schema_compiler/compiler.py.
 // NOTE: The format of types has changed. 'FooType' is now
 //   'chrome.languageSettingsPrivate.FooType'.
 // Please run the closure compiler before committing changes.
 // See https://code.google.com/p/chromium/wiki/ClosureCompilation.
@@ skipping 67 matching lines @@
 chrome.languageSettingsPrivate.setLanguageList = function(languageCodes) {};
 
 /**
  * Gets the current status of the chosen spell check dictionaries.
  * @param {function(!Array<!chrome.languageSettingsPrivate.SpellcheckDictionaryStatus>):void} callback
  * @see https://developer.chrome.com/extensions/languageSettingsPrivate#method-getSpellcheckDictionaryStatuses
  */
 chrome.languageSettingsPrivate.getSpellcheckDictionaryStatuses = function(callback) {};
 
 /**
- * Gets the custom spell check words.
+ * Gets the custom spell check words, in sorted order.
  * @param {function(!Array<string>):void} callback
  * @see https://developer.chrome.com/extensions/languageSettingsPrivate#method-getSpellcheckWords
  */
 chrome.languageSettingsPrivate.getSpellcheckWords = function(callback) {};
 
 /**
+ * Adds a word to the custom dictionary.
+ * @param {string} word
+ * @see https://developer.chrome.com/extensions/languageSettingsPrivate#method-addSpellcheckWord
+ */
+chrome.languageSettingsPrivate.addSpellcheckWord = function(word) {};
+
+/**
+ * Removes a word from the custom dictionary.
+ * @param {string} word
+ * @see https://developer.chrome.com/extensions/languageSettingsPrivate#method-removeSpellcheckWord
+ */
+chrome.languageSettingsPrivate.removeSpellcheckWord = function(word) {};
+
+/**
  * Gets the translate target language (in most cases, the display locale).
  * @param {function(string):void} callback
  * @see https://developer.chrome.com/extensions/languageSettingsPrivate#method-getTranslateTargetLanguage
  */
 chrome.languageSettingsPrivate.getTranslateTargetLanguage = function(callback) {};
 
 /**
  * Gets all supported input methods, including IMEs. Chrome OS only.
  * @param {function(!chrome.languageSettingsPrivate.InputMethodLists):void} callback
  * @see https://developer.chrome.com/extensions/languageSettingsPrivate#method-getInputMethodLists
@@ skipping 40 matching lines @@
 chrome.languageSettingsPrivate.onInputMethodAdded;
 
 /**
  * Called when an input method is removed.
  * @type {!ChromeEvent}
  * @see https://developer.chrome.com/extensions/languageSettingsPrivate#event-onInputMethodRemoved
  */
 chrome.languageSettingsPrivate.onInputMethodRemoved;