Implement support for <audio> in ChromeVox Next.

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']);
 
 /**
  * Test fixture for output.js.
  * @constructor
@@ skipping 119 matching lines @@
 
       el = el.nextSibling;
       range = cursors.Range.fromNode(el);
       o = new Output().withSpeechAndBraille(range, null, 'navigate');
       assertEqualsJSON({string_: 'Heading 6f', 'spans_': [
         // Attributes.
         {value: 'name', start: 9, end: 10}
       ]}, o.toSpannable());
   });
 });
+
+TEST_F('OutputE2ETest', 'Audio', function() {
+  this.runWithLoadedTree('<audio src="foo.mp3" controls></audio>',
+    function(root) {
+      var el = root.firstChild.firstChild.firstChild.firstChild;
+      var range = cursors.Range.fromNode(el);
+      var o = new Output().withSpeechAndBraille(range, null, 'navigate');
+      assertEqualsJSON({string_: 'media control|Tool bar|||play|Button',
+          spans_:
+              // Entered container toolbar.
+
+              // Button.
+              [{value: 'name', start: 23, end: 23},
+              {value: 'value', start: 24, end: 24},
+              {value: 'description', start: 25, end: 29},
+              {value: 'role', start: 30, end: 36},
+
+              // Button earcon.
+              {value: {}, start: 30, end: 36}]
+          }, o.toSpannableForTest());
+
+      el = el.nextSibling;
+      var prevRange = range;
+      range = cursors.Range.fromNode(el);
+      var o = new Output().withSpeechAndBraille(range, prevRange, 'navigate');
+      assertEqualsJSON({string_: '0, , slider|audio time scrubber',
+          spans_:
+              [{value: 'help', start: 12, end: 31}]
+          }, o.toSpannableForTest());
+  });
+});