Only process checked state changed for specific roles.

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 be3ffc717e0bbc8b173c64a5b6041c92cadcdb57..724272e27a88e2b63cc283707ad779ade48bd92b 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
@@ -45,7 +45,7 @@ DesktopAutomationHandler = function(node) {
   this.addListener_(e.activedescendantchanged, this.onActiveDescendantChanged);
   this.addListener_(e.alert, this.onAlert);
   this.addListener_(e.ariaAttributeChanged, this.onEventIfInRange);
-  this.addListener_(e.checkedStateChanged, this.onEventIfInRange);
+  this.addListener_(e.checkedStateChanged, this.onCheckedStateChanged);
   this.addListener_(e.focus, this.onFocus);
   this.addListener_(e.hover, this.onHover);
   this.addListener_(e.loadComplete, this.onLoadComplete);
@@ -195,6 +195,19 @@ DesktopAutomationHandler.prototype = {
   },
 
   /**
+   * Provides all feedback once a checked state changed event fires.
+   * @param {!AutomationEvent} evt
+   */
+  onCheckedStateChanged: function(evt) {
+    if (!AutomationPredicate.checkable(evt.target))
+      return;
+
+    this.onEventIfInRange(
+        new chrome.automation.AutomationEvent(
+            EventType.checkedStateChanged, evt.target));
+  },
+
+  /**
    * Provides all feedback once a focus event fires.
    * @param {!AutomationEvent} evt
    */