Revert of Remove unused imports in webkitpy.

third_party/WebKit/Tools/Scripts/webkitpy/common/system/executive.py

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 # Copyright (c) 2009 Apple Inc. All rights reserved.
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+import StringIO
 import csv
 import errno
 import logging
 import multiprocessing
 import os
 import signal
 import subprocess
 import sys
 import time
 
+from webkitpy.common.system.outputtee import Tee
 from webkitpy.common.system.filesystem import FileSystem
 
 
 _log = logging.getLogger(__name__)
 
 
 class ScriptError(Exception):
 
     def __init__(self,
                  message=None,
@@ skipping 426 matching lines @@
             pool.close()
             pool.join()
 
 
 def _run_command_thunk(cmd_line_and_cwd):
     # Note that this needs to be a bare module (and hence Picklable) method to work with multiprocessing.Pool.
     (cmd_line, cwd) = cmd_line_and_cwd
     proc = subprocess.Popen(cmd_line, cwd=cwd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     stdout, stderr = proc.communicate()
     return (proc.returncode, stdout, stderr)