Use shlex.split() to parse --special-command test argument

tools/test.py

 #!/usr/bin/env python
 #
 # Copyright 2012 the V8 project authors. 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
@@ skipping 1353 matching lines @@
 
 
 def GetSpecialCommandProcessor(value):
   if (not value) or (value.find('@') == -1):
     def ExpandCommand(args):
       return args
     return ExpandCommand
   else:
     pos = value.find('@')
     import urllib
-    prefix = urllib.unquote(value[:pos]).split()
-    suffix = urllib.unquote(value[pos+1:]).split()
+    import shlex
+    prefix = shlex.split(urllib.unquote(value[:pos]))
+    suffix = shlex.split(urllib.unquote(value[pos+1:]))
     def ExpandCommand(args):
       return prefix + args + suffix
     return ExpandCommand
 
 
 BUILT_IN_TESTS = ['mjsunit', 'cctest', 'message', 'preparser']
 
 
 def GetSuites(test_root):
   def IsSuite(path):
@@ skipping 161 matching lines @@
     for entry in timed_tests[:20]:
       t = FormatTime(entry.duration)
       sys.stderr.write("%4i (%s) %s\n" % (index, t, entry.GetLabel()))
       index += 1
 
   return result
 
 
 if __name__ == '__main__':
   sys.exit(Main())