Don't pretend that text-decoration is a shorthand in computed style.

Tools/Scripts/webkitpy/layout_tests/port/base.py

 # Copyright (C) 2010 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 1711 matching lines @@
                              ['--enable-threaded-compositing', '--enable-impl-side-painting', '--force-compositing-mode']),
             VirtualTestSuite('serviceworker',
                              'http/tests/serviceworker',
                              ['--enable-service-worker',
                               '--force-compositing-mode']),
             VirtualTestSuite('targetedstylerecalc',
                              'fast/css/invalidation',
                              ['--enable-targeted-style-recalc',
                               '--force-compositing-mode']),
             VirtualTestSuite('stable',
+                             'fast/css3-text/css3-text-decoration/stable',
+                             ['--stable-release-mode',
+                              '--force-compositing-mode']),
+            VirtualTestSuite('stable',
                              'http/tests/websocket',
                              ['--stable-release-mode',
                               '--force-compositing-mode']),
             VirtualTestSuite('stable',
                              'http/tests/security/mixedContent/websocket',
                              ['--stable-release-mode',
                               '--force-compositing-mode']),
             VirtualTestSuite('stable',
                              'web-animations-api/eased-keyframes.html',
                              ['--stable-release-mode',
@@ skipping 189 matching lines @@
 
 class PhysicalTestSuite(object):
     def __init__(self, base, args):
         self.name = base
         self.base = base
         self.args = args
         self.tests = set()
 
     def __repr__(self):
         return "PhysicalTestSuite('%s', '%s', %s)" % (self.name, self.base, self.args)