Add a $joinedDescendants output specifier.

chrome/browser/resources/chromeos/chromevox/cvox2/background/live_regions_test.extjs

 // 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.
 
 // Include test fixture.
 GEN_INCLUDE(['../../testing/chromevox_next_e2e_test_base.js',
              '../../testing/assert_additions.js']);
 
 GEN_INCLUDE(['../../testing/mock_feedback.js']);
 
@@ skipping 92 matching lines @@
       <script>
         document.getElementById('go').addEventListener('click', function() {
           document.getElementById('c').textContent = 'Charlie';
           document.getElementById('a').textContent = 'Alpha';
         }, false);
       </script>
     */},
     function(rootNode) {
       var go = rootNode.find({ role: RoleType.button });
       mockFeedback.call(go.doDefault.bind(go))
-          .expectQueuedSpeech('Alpha')
-          .expectQueuedSpeech('Bravo')
-          .expectQueuedSpeech('Charlie');
+          .expectQueuedSpeech('Alpha  Bravo  Charlie ')
       mockFeedback.replay();
     });
 });
 
 TEST_F('LiveRegionsTest', 'LiveRegionChangeImageAlt', function() {
   // Note that there is a live region outputted as a result of page load; the
   // test expects a live region announcement after a click on the button, but
   // the LiveRegions module has a half second filter for live region
   // announcements on the same node. Set that timeout to 0 to prevent
   // flakeyness.
@@ skipping 117 matching lines @@
     var focusAfterNodeChange = window.setTimeout.bind(window, function() {
       root.firstChild.nextSibling.focus();
     }, 1000);
     mockFeedback.call(focusAfterNodeChange)
         .expectSpeech('hello!')
         .expectNextSpeechUtteranceIsNot('hello!')
         .expectNextSpeechUtteranceIsNot('hello!')       ;
     mockFeedback.replay();
   });
 });