add PRESUBMIT for native_client_sdk.

native_client_sdk/src/tools/zip_test.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.
 
 import doctest
 import os
 import oshelpers
 import shutil
 import subprocess
@@ skipping 77 matching lines @@
     file2 = self.MakeFile('file2', 3354)
     self.RunZip([self.zipname, file1, file2])
     self.OpenZipFile()
     self.assertEqual(len(self.zipfile.namelist()), 2)
     self.assertEqual(self.GetZipInfo(file1).file_size, 1024)
     self.assertEqual(self.GetZipInfo(file2).file_size, 3354)
     # make sure files are added in order
     self.assertEqual(self.zipfile.namelist()[0], file1)
 
   def testAddFilesWithGlob(self):
-    file1 = self.MakeFile('file1', 1024)
-    file2 = self.MakeFile('file2', 3354)
+    self.MakeFile('file1', 1024)
+    self.MakeFile('file2', 3354)
     self.RunZip([self.zipname, 'file*'])
     self.OpenZipFile()
     self.assertEqual(len(self.zipfile.namelist()), 2)
 
   def testAddDir(self):
     os.mkdir(self.GetTempPath('dir1'))
     self.RunZip([self.zipname, 'dir1'])
     self.OpenZipFile()
     self.assertEqual(len(self.zipfile.namelist()), 1)
 
@@ skipping 38 matching lines @@
     self.assertEqual(self.GetZipInfo(file2).file_size, 256)
     self.assertEqual(self.zipfile.namelist()[2], file3)
     self.assertEqual(self.GetZipInfo(file3).file_size, 768)
     self.assertEqual(self.zipfile.namelist()[3], file4)
     self.assertEqual(self.GetZipInfo(file4).file_size, 1024)
 
   def testUpdateSubdirectory(self):
     os.mkdir(self.GetTempPath('dir1'))
     file1 = self.MakeFile(os.path.join('dir1', 'file1'), 256)
     os.mkdir(self.GetTempPath(os.path.join('dir1', 'dir2')))
-    file2 = self.MakeFile(os.path.join('dir1', 'dir2', 'file2'), 1234)
+    self.MakeFile(os.path.join('dir1', 'dir2', 'file2'), 1234)
     self.RunZip([self.zipname, '-r', 'dir1'])
     self.OpenZipFile()
     self.assertEqual(len(self.zipfile.namelist()), 4)
     self.assertEqual(self.GetZipInfo(file1).file_size, 256)
     self.CloseZipFile()
 
     self.MakeFile(file1, 2560)
     self.RunZip([self.zipname, file1])
     self.OpenZipFile()
     self.assertEqual(len(self.zipfile.namelist()), 4)
@@ skipping 13 matching lines @@
     self.assertEqual(len(self.zipfile.namelist()), 3)
 
 
 def main():
   suite = unittest.TestLoader().loadTestsFromTestCase(TestZip)
   suite.addTests(doctest.DocTestSuite(oshelpers))
   result = unittest.TextTestRunner(verbosity=2).run(suite)
   return int(not result.wasSuccessful())
 
 
-if __name__=='__main__':
+if __name__ == '__main__':
   sys.exit(main())