Don't output earcons when constructing output from descendants

chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
index 550398551a36c7b93142193392f7fbcf8717dcab..7e9cfb133a9e1704b81dd7fa88fbe0efd6880fa5 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js
@@ -46,7 +46,7 @@ DesktopAutomationHandler = function(node) {
   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);
@@ -182,6 +182,15 @@ DesktopAutomationHandler.prototype = {
   /**
    * @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)