Ensure fake alert window attached to AXAura tree and refine alert dialog output

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

 // Copyright 2014 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 Provides output services for ChromeVox.
  */
 
 goog.provide('Output');
 goog.provide('Output.EventType');
@@ skipping 382 matching lines @@
       braille: ''
     },
     abstractContainer: {
       enter: '$nameFromNode $role $state $description',
       leave: '@exited_container($role)'
     },
     alert: {
       speak: '$earcon(ALERT_NONMODAL) $role $descendants $state'
     },
     alertDialog: {
-      enter: '$nameFromNode $role $description',
-      speak: '$name $role $descendants $state'
+      enter: '$earcon(ALERT_MODAL) $name $state',
+      speak: '$earcon(ALERT_MODAL) $name $descendants $state $role'
     },
     cell: {
       enter: '@cell_summary($tableCellRowIndex, $tableCellColumnIndex) ' +
           '$node(tableColumnHeader)',
       speak: '@cell_summary($tableCellRowIndex, $tableCellColumnIndex) ' +
           '$node(tableColumnHeader) $state'
     },
     checkBox: {
       speak: '$if($checked, $earcon(CHECK_ON), $earcon(CHECK_OFF)) ' +
              '$name $role $checked $description $state'
@@ skipping 1414 matching lines @@
   /**
    * Gets the output buffer for braille.
    * @return {!Spannable}
    */
   get brailleOutputForTest() {
     return this.mergeBraille_(this.brailleBuffer_);
   }
 };
 
 });  // goog.scope