Take 2 of splitting html tests into subtests. Had to make two changes to drt to

tools/testing/drt-trampoline.py

 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 # For now we have to use this trampoline to turn --dart-flags command line
 # switch into env variable DART_FLAGS.  Eventually, DumpRenderTree should
 # support --dart-flags and this hack may go away.
 #
 # Expected invocation: python drt-trampoline.py <path to DRT> <DRT command line>
 
@@ skipping 23 matching lines @@
       env['DART_FLAGS'] = arg[len(DART_FLAGS_PREFIX):]
     elif arg.startswith(OUT_EXPECTATION_PREFIX):
       out_expected_file = arg[len(OUT_EXPECTATION_PREFIX):]
       if out_expected_file.endswith('.png'):
         cmd.append('--notree')
         is_png = True
       elif not out_expected_file.endswith('.txt'):
         raise Exception(
             'Bad file expectation (%s), ' % out_expected_file
             + 'please specify either a .txt or a .png file')
-    elif arg.endswith('.html'):
+    elif '.html' in arg:
       test_file = arg
     else:
       cmd.append(arg)
 
   if is_png:
     # pixel tests are specified by running DRT "foo.html'-p"
     cmd.append(test_file + "'-p")
   else:
     cmd.append(test_file)
 
@@ skipping 53 matching lines @@
       print 'You can update expectations by running:\n'
       print 'cp %s %s\n' % (out_file, out_expected_file)
     print '#EOF'
 
 if __name__ == '__main__':
   try:
     sys.exit(main(sys.argv))
   except StandardError as e:
     print 'Fail: ' + str(e)
     sys.exit(1)