Fix python scripts in src/ppapi/

ppapi/generators/idl_outfile.py

-#!/usr/bin/python
-#
+#!/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.
 
 """ Output file objects for generator. """
 
 import difflib
 import os
 import time
 import sys
@@ skipping 100 matching lines @@
       return True
 
     except IOError as (errno, strerror):
       ErrOut.Log("I/O error(%d): %s" % (errno, strerror))
     except:
       ErrOut.Log("Unexpected error: %s" % sys.exc_info()[0])
       raise
 
     return False
 
+
 def TestFile(name, stringlist, force, update):
   errors = 0
 
   # Get the old timestamp
   if os.path.exists(name):
     old_time = os.stat(filename)[ST_MTIME]
   else:
     old_time = 'NONE'
 
   # Create the file and write to it
@@ skipping 15 matching lines @@
       return 1
   else:
     if wrote:
       ErrOut.Log('Should not have writen output %s.' % filename)
       return 1
     if cur_time != old_time:
       ErrOut.Log('Should not have modified timestamp for %s.' % filename)
       return 1
   return 0
 
-if __name__ == '__main__':
 
+def main():
   errors = 0
   stringlist = ['Test', 'Testing\n', 'Test']
   filename = 'outtest.txt'
 
   # Test forcibly writing a file
   errors += TestFile(filename, stringlist, force=True, update=True)
 
   # Test conditionally writing the file skipping
   errors += TestFile(filename, stringlist, force=False, update=False)
 
   # Test conditionally writing the file updating
   errors += TestFile(filename, stringlist + ['X'], force=False, update=True)
 
   # Clean up file
   os.remove(filename)
   if not errors: InfoOut.Log('All tests pass.')
-  sys.exit(errors)
+  return errors
+
+
+if __name__ == '__main__':
+  sys.exit(main())