Add pylint to presubmit checks

presubmit_support.py

 #!/usr/bin/python
 # Copyright (c) 2006-2009 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.
 
 """Enables directory-specific presubmit checks to run at upload and/or commit.
 """
 
 __version__ = '1.3.5'
 
@@ skipping 570 matching lines @@
     self._name = name
     self._full_description = description
     # Convert root into an absolute path.
     self._local_root = os.path.abspath(local_root)
     self.issue = issue
     self.patchset = patchset
     self.scm = ''
 
     # From the description text, build up a dictionary of key/value pairs
     # plus the description minus all key/value or "tag" lines.
-    self._description_without_tags = []
+    description_without_tags = []
     self.tags = {}
     for line in self._full_description.splitlines():
       m = self._TAG_LINE_RE.match(line)
       if m:
         self.tags[m.group('key')] = m.group('value')
       else:
-        self._description_without_tags.append(line)
+        description_without_tags.append(line)
 
     # Change back to text and remove whitespace at end.
-    self._description_without_tags = '\n'.join(self._description_without_tags)
-    self._description_without_tags = self._description_without_tags.rstrip()
+    self._description_without_tags = (
+        '\n'.join(description_without_tags).rstrip())
 
     self._affected_files = [
         self._AFFECTED_FILES(info[1], info[0].strip(), self._local_root)
         for info in files
     ]
 
   def Name(self):
     """Returns the change name."""
     return self._name
 
@@ skipping 474 matching lines @@
                                options.commit,
                                options.verbose,
                                sys.stdout,
                                sys.stdin,
                                options.default_presubmit,
                                options.may_prompt)
 
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv))