Add a new 'format-webkitpy' command that will reformat code to the style guide.

Tools/Scripts/webkitpy/common/system/executive_mock.py

 # Copyright (C) 2011 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 150 matching lines @@
         num_previous_calls = len(self.calls)
         command_outputs = []
         for cmd_line, cwd in commands:
             command_outputs.append([0, self.run_command(cmd_line, cwd=cwd), ''])
 
         new_calls = self.calls[num_previous_calls:]
         self.calls = self.calls[:num_previous_calls]
         self.calls.append(new_calls)
         return command_outputs
 
+    def map(self, thunk, arglist, processes=None):
+        return map(thunk, arglist)
+
 
 class MockExecutive2(MockExecutive):
     """MockExecutive2 is like MockExecutive except it doesn't log anything."""
 
     def __init__(self, output='', exit_code=0, exception=None, run_command_fn=None, stderr=''):
         self._output = output
         self._stderr = stderr
         self._exit_code = exit_code
         self._exception = exception
         self._run_command_fn = run_command_fn
@@ skipping 16 matching lines @@
         if self._run_command_fn:
             return self._run_command_fn(args)
         if return_exit_code:
             return self._exit_code
         if self._exit_code and error_handler:
             script_error = ScriptError(script_args=args, exit_code=self._exit_code, output=self._output)
             error_handler(script_error)
         if return_stderr:
             return self._output + self._stderr
         return self._output