[NaCl SDK] Add keyboard interrupt handlers for python scripts

native_client_sdk/src/tools/tests/oshelpers_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 os
 import shutil
 import subprocess
 import sys
 import tempfile
@@ skipping 64 matching lines @@
   def OpenZipFile(self):
     self.zipfile = zipfile.ZipFile(self.GetTempPath(self.zipname), 'r')
 
   def CloseZipFile(self):
     self.zipfile.close()
     self.zipfile = None
 
   def GetZipInfo(self, path):
     return self.zipfile.getinfo(oshelpers.OSMakeZipPath(path))
 
-
   def testNothingToDo(self):
     self.assertRaises(subprocess.CalledProcessError, self.RunZip,
         self.zipname, 'nonexistent_file')
     self.assertFalse(os.path.exists(self.zipname))
 
   def testAddSomeFiles(self):
     file1 = self.MakeFile('file1', 1024)
     file2 = self.MakeFile('file2', 3354)
     self.RunZip(self.zipname, file1, file2)
     self.OpenZipFile()
@@ skipping 152 matching lines @@
     bin_cp = self.MakeExecutableFile('bin', 'cp')
     cp = os.path.basename(bin_cp)
 
     # Note, "bin" not added to PATH.
     output, _ = self.RunWhich(bin_cp)
     self.assertTrue(os.path.join('bin', cp) in output)
 
 
 if __name__ == '__main__':
   unittest.main()