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

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

Index: Tools/Scripts/webkitpy/common/system/systemhost.py
diff --git a/Tools/Scripts/webkitpy/common/system/systemhost.py b/Tools/Scripts/webkitpy/common/system/systemhost.py
index 2abab964fef19b0988486146026ec9a704921870..fb4f09a419ef36481ac9a5f62b1b3a57ed3cf99a 100644
--- a/Tools/Scripts/webkitpy/common/system/systemhost.py
+++ b/Tools/Scripts/webkitpy/common/system/systemhost.py
@@ -41,6 +41,9 @@ class SystemHost(object):
         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())
@@ -48,8 +51,5 @@ class SystemHost(object):
     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)