Support basic stereo pan positioning for earcons

chrome/browser/resources/chromeos/chromevox/host/interface/abstract_earcons.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 Base class for implementing earcons.
  *
  * When adding earcons, please add them to getEarconName and getEarconId.
  *
  */
@@ skipping 71 matching lines @@
  * Public static flag set to enable or disable earcons. Callers should prefer
  * toggle(); however, this member is public for initialization.
  * @type {boolean}
  */
 cvox.AbstractEarcons.enabled = true;
 
 
 /**
  * Plays the specified earcon sound.
  * @param {cvox.Earcon} earcon An earcon identifier.
+ * @param {Object=} opt_location A location associated with the earcon such as a
+ * control's bounding rectangle.
  */
-cvox.AbstractEarcons.prototype.playEarcon = function(earcon) {
+cvox.AbstractEarcons.prototype.playEarcon = function(earcon, opt_location) {
 };
 
 
 /**
  * Cancels the specified earcon sound.
  * @param {cvox.Earcon} earcon An earcon identifier.
  */
 cvox.AbstractEarcons.prototype.cancelEarcon = function(earcon) {
 };
 
 
 /**
  * Whether or not earcons are available.
  * @return {boolean} True if earcons are available.
  */
 cvox.AbstractEarcons.prototype.earconsAvailable = function() {
   return true;
 };
 
 
 /**
  * Toggles earcons on or off.
  * @return {boolean} True if earcons are now enabled; false otherwise.
  */
 cvox.AbstractEarcons.prototype.toggle = function() {
   cvox.AbstractEarcons.enabled = !cvox.AbstractEarcons.enabled;
   return cvox.AbstractEarcons.enabled;
 };