Add a $joinedDescendants output specifier.

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

 // 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.
 
 GEN_INCLUDE(['../../testing/assert_additions.js']);
 GEN_INCLUDE(['../../testing/chromevox_next_e2e_test_base.js']);
 
 /**
  * Gets the braille output and asserts that it matches expected values.
  * Annotations in the output that are primitive strings are ignored.
@@ skipping 591 matching lines @@
       var el = root.firstChild;
       var o = new Output().withSpeech(cursors.Range.fromNode(el));
       assertEqualsJSON({string_: '|Subscribe|Check box|not checked', spans_: [
         {value: {earconId: 'CHECK_OFF'}, start: 0, end: 0},
         {value: 'name', start: 1, end:10},
         {value: 'role', start: 11, end: 20},
         {value: 'state', start: 21, end: 32}
       ]}, o.speechOutputForTest);
   });
 });
+
+TEST_F('OutputE2ETest', 'JoinDescendants', function() {
+  this.runWithLoadedTree(function() {/*!
+      <p>This</p>
+      <p>fragment</p>
+      <p>Should be separated</p>
+      <p>with spaces</p>
+    */},
+    function(root) {
+      var unjoined = new Output().format('$descendants', root);
+      assertEquals('This|fragment|Should be separated|with spaces'
+                   , unjoined.speechOutputForTest.string_);
+
+      var joined = new Output().format('$joinedDescendants', root);
+      assertEquals('This fragment Should be separated with spaces'
+                   , joined.speechOutputForTest.string_);
+  });
+});