Don't output earcons when constructing output from descendants

chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.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.
 
 /**
  * @fileoverview Handles automation from a desktop automation node.
  */
 
 goog.provide('DesktopAutomationHandler');
 
@@ skipping 28 matching lines @@
   /**
    * The last time we handled a value changed event.
    * @type {!Date}
    * @private
    */
   this.lastValueChanged_ = new Date(0);
 
   var e = EventType;
   this.addListener_(e.activedescendantchanged, this.onActiveDescendantChanged);
   this.addListener_(e.alert, this.onAlert);
-  this.addListener_(e.ariaAttributeChanged, this.onEventIfInRange);
+  this.addListener_(e.ariaAttributeChanged, this.onAriaAttributeChanged);
   this.addListener_(e.autocorrectionOccured, this.onEventIfInRange);
   this.addListener_(e.checkedStateChanged, this.onCheckedStateChanged);
   this.addListener_(e.childrenChanged, this.onActiveDescendantChanged);
   this.addListener_(e.expandedChanged, this.onEventIfInRange);
   this.addListener_(e.focus, this.onFocus);
   this.addListener_(e.hover, this.onHover);
   this.addListener_(e.invalidStatusChanged, this.onEventIfInRange);
   this.addListener_(e.loadComplete, this.onLoadComplete);
   this.addListener_(e.menuEnd, this.onMenuEnd);
   this.addListener_(e.menuListItemSelected, this.onEventIfSelected);
@@ skipping 115 matching lines @@
    * @param {!AutomationEvent} evt
    */
   onEventWithFlushedOutput: function(evt) {
     Output.forceModeForNextSpeechUtterance(cvox.QueueMode.FLUSH);
     this.onEventDefault(evt);
   },
 
   /**
    * @param {!AutomationEvent} evt
    */
+  onAriaAttributeChanged: function(evt) {
+    if (evt.target.state.editable)
+      return;
+    this.onEventIfInRange(evt);
+  },
+
+  /**
+   * @param {!AutomationEvent} evt
+   */
   onHover: function(evt) {
     if (ChromeVoxState.instance.currentRange &&
         evt.target == ChromeVoxState.instance.currentRange.start.node)
       return;
     Output.forceModeForNextSpeechUtterance(cvox.QueueMode.FLUSH);
     this.onEventDefault(evt);
   },
 
   /**
    * Makes an announcement without changing focus.
@@ skipping 272 matching lines @@
 DesktopAutomationHandler.init_ = function() {
   chrome.automation.getDesktop(function(desktop) {
     ChromeVoxState.desktopAutomationHandler =
         new DesktopAutomationHandler(desktop);
   });
 };
 
 DesktopAutomationHandler.init_();
 
 });  // goog.scope