Fix issues with sending tts queue lots of utterances

chrome/browser/resources/chromeos/chromevox/cvox2/background/live_regions.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 Implements support for live regions in ChromeVox Next.
  */
 
 goog.provide('LiveRegions');
 
@@ skipping 116 matching lines @@
   outputLiveRegionChange_: function(node, opt_prependFormatStr) {
     if (node.containerLiveBusy)
       return;
 
     if (node.containerLiveAtomic && !node.liveAtomic) {
       if (node.parent)
         this.outputLiveRegionChange_(node.parent, opt_prependFormatStr);
       return;
     }
 
+    // Alerts should be announced as a result of focus.
+    if (node.role == RoleType.alert)
+      return;
+
     var range = cursors.Range.fromNode(node);
     var output = new Output();
     if (opt_prependFormatStr)
       output.format(opt_prependFormatStr);
     output.withSpeech(range, range, Output.EventType.NAVIGATE);
 
     if (!output.hasSpeech && node.liveAtomic)
       output.format('$joinedDescendants', node);
 
     output.withSpeechCategory(cvox.TtsCategory.LIVE);
@@ skipping 29 matching lines @@
       parent = parent.parent;
     }
 
     this.liveRegionNodeSet_.add(node);
     output.go();
     this.lastLiveRegionTime_ = currentTime;
   },
 };
 
 });  // goog.scope