Use category flush for focus events.

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

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
index c464f1cfb76d8316bb2ba55d335da481d447daad..70a50675ccda9d2187f05b1a7033998d2ec2dd15 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
@@ -127,10 +127,10 @@ Background = function() {
 
   cvox.ExtensionBridge.addMessageListener(this.onMessage_);
 
-  /** @type {!BackgroundKeyboardHandler} */
+  /** @type {!BackgroundKeyboardHandler} @private */
   this.keyboardHandler_ = new BackgroundKeyboardHandler();
 
-  /** @type {!LiveRegions} */
+  /** @type {!LiveRegions} @private */
   this.liveRegions_ = new LiveRegions(this);
 
   /** @type {boolean} @private */
@@ -139,6 +139,7 @@ Background = function() {
   /**
    * Stores the mode as computed the last time a current range was set.
    * @type {?ChromeVoxMode}
+   * @private
    */
   this.mode_ = null;
 
@@ -519,6 +520,7 @@ Background.prototype = {
    * 1. a url is blacklisted for Classic.
    * 2. the current range is not within web content.
    * @param {string} url
+   * @return {boolean}
    */
   isWhitelistedForCompat_: function(url) {
     return this.isBlacklistedForClassic_(url) || (this.getCurrentRange() &&
@@ -626,7 +628,7 @@ Background.prototype = {
         } else if (action == 'onCommand') {
           CommandHandler.onCommand(msg['command']);
         } else if (action == 'flushNextUtterance') {
-          Output.flushNextSpeechUtterance();
+          Output.forceModeForNextSpeechUtterance(cvox.QueueMode.FLUSH);
         }
         break;
     }