Introduce new basic playback test.

chrome/test/functional/PYAUTO_TESTS

 # Copyright (c) 2012 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.
 #
 # This file lists the pyauto tests that run as a part of the functional test
 # suite.
 #
 # Tests can be enabled on a per-platform basis. Tests not listed here will
 # not be run.
 #
@@ skipping 36 matching lines @@
       'execute_javascript',
       'extensions',
       'find_in_page',
       'flash',
       'history',
       'https',
       'imports',
       'indexeddb',
       'infobars',
       'instant',
+      'media.media_basic_playback',
       'multiprofile',
       'navigation',
       'notifications',
       'ntp',
       'omnibox',
       'passwords',
       'pdf',
       'plugins',
       'plugins_check',
       'policy',
@@ skipping 556 matching lines @@
     ],
   },
 
   # HTML5 media performance tests.
   'AV_PERF': {
      'linux': [
        'media.media_constrained_network_perf',
      ],
   },
 }