Complete checked state announcements and clarify state usage

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 209 matching lines @@
   },
 
   /**
    * Provides all feedback once a checked state changed event fires.
    * @param {!AutomationEvent} evt
    */
   onCheckedStateChanged: function(evt) {
     if (!AutomationPredicate.checkable(evt.target))
       return;
 
+    Output.forceModeForNextSpeechUtterance(cvox.QueueMode.CATEGORY_FLUSH);
     this.onEventIfInRange(
         new chrome.automation.AutomationEvent(
             EventType.checkedStateChanged, evt.target, evt.eventFrom));
   },
 
   /**
    * Provides all feedback once a focus event fires.
    * @param {!AutomationEvent} evt
    */
   onFocus: function(evt) {
@@ skipping 273 matching lines @@
 DesktopAutomationHandler.init_ = function() {
   chrome.automation.getDesktop(function(desktop) {
     ChromeVoxState.desktopAutomationHandler =
         new DesktopAutomationHandler(desktop);
   });
 };
 
 DesktopAutomationHandler.init_();
 
 });  // goog.scope