Implement ChromeVox Next menus.

chrome/browser/resources/chromeos/chromevox/host/interface/tts_interface.js

 // Copyright 2014 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 Defines a Tts interface.
  *
  * All TTS engines in ChromeVox conform to the this interface.
  *
  */
@@ skipping 92 matching lines @@
  * Increases a TTS speech property.
  * @param {string} propertyName The name of the property to change.
  * @param {boolean} increase If true, increases the property value by one
  *     step size, otherwise decreases.
  */
 cvox.TtsInterface.prototype.increaseOrDecreaseProperty =
     function(propertyName, increase) { };
 
 
 /**
+ * Converts an engine property value to a percentage from 0.00 to 1.00.
+ * @param {string} property The property to convert.
+ * @return {?number} The percentage of the property.
+ */
+cvox.TtsInterface.prototype.propertyToPercentage = function(property) { };
+
+
+/**
  * Returns the default properties of the first tts that has default properties.
  * @param {string} property Name of property.
  * @return {?number} The default value.
  */
 cvox.TtsInterface.prototype.getDefaultProperty = function(property) { };