Default target_platform to None.

grit_info.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 '''Tool to determine inputs and outputs of a grit file.
 '''
 
 import optparse
 import os
 import posixpath
 import sys
 
 from grit import grd_reader
 from grit import util
 
 class WrongNumberOfArguments(Exception):
   pass
 
 
-def Outputs(filename, defines, ids_file, target_platform):
+def Outputs(filename, defines, ids_file, target_platform=None):
   grd = grd_reader.Parse(
       filename, defines=defines, tags_to_ignore=set(['messages']),
       first_ids_file=ids_file, target_platform=target_platform)
 
   target = []
   lang_folders = {}
   # Add all explicitly-specified output files
   for output in grd.GetOutputFiles():
     path = output.GetFilename()
     target.append(path)
@@ skipping 23 matching lines @@
 def GritSourceFiles():
   files = []
   grit_root_dir = os.path.relpath(os.path.dirname(__file__), os.getcwd())
   for root, dirs, filenames in os.walk(grit_root_dir):
     grit_src = [os.path.join(root, f) for f in filenames
                 if f.endswith('.py')]
     files.extend(grit_src)
   return sorted(files)
 
 
-def Inputs(filename, defines, ids_file, target_platform):
+def Inputs(filename, defines, ids_file, target_platform=None):
   grd = grd_reader.Parse(
       filename, debug=False, defines=defines, tags_to_ignore=set(['message']),
       first_ids_file=ids_file, target_platform=target_platform)
   files = set()
   for lang, ctx in grd.GetConfigurations():
     grd.SetOutputLanguage(lang or grd.GetSourceLanguage())
     grd.SetOutputContext(ctx)
     for node in grd.ActiveDescendants():
       with node:
         if (node.name == 'structure' or node.name == 'skeleton' or
@@ skipping 96 matching lines @@
   except WrongNumberOfArguments, e:
     PrintUsage()
     print e
     return 1
   print result
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))