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

Tools/Scripts/webkitpy/common/system/systemhost.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 23 matching lines @@
 
 
 class SystemHost(object):
     def __init__(self):
         self.executable = sys.executable
         self.executive = executive.Executive()
         self.filesystem = filesystem.FileSystem()
         self.user = user.User()
         self.platform = platforminfo.PlatformInfo(sys, platform, self.executive)
         self.workspace = workspace.Workspace(self.filesystem, self.executive)
+        self.stdin = sys.stdin
+        self.stdout = sys.stdout
+        self.stderr = sys.stderr
 
     def copy_current_environment(self):
         return environment.Environment(os.environ.copy())
 
     def print_(self, *args, **kwargs):
         sep = kwargs.get('sep', ' ')
         end = kwargs.get('end', '\n')
-        file = kwargs.get('file', None)
-        stderr = kwargs.get('stderr', False)
-
-        file = file or (sys.stderr if stderr else sys.stdout)
-        file.write(sep.join([str(arg) for arg in args]) + end)
+        stream = kwargs.get('stream', self.stdout)
+        stream.write(sep.join([str(arg) for arg in args]) + end)