Make wpt-import --auto-update pass if the issue is closed after CQ.

third_party/WebKit/Tools/Scripts/webkitpy/common/net/git_cl.py

 # Copyright 2016 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.
 
 """An interface to git-cl.
 
 The git-cl tool is responsible for communicating with Rietveld, Gerrit,
 and Buildbucket to manage changelists and try jobs associated with them.
 """
 
@@ skipping 51 matching lines @@
     def fetch_try_results(self):
         """Requests results of try jobs for the current CL."""
         with self._host.filesystem.mkdtemp() as temp_directory:
             results_path = self._host.filesystem.join(temp_directory, 'try-results.json')
             self.run(['try-results', '--json', results_path])
             contents = self._host.filesystem.read_text_file(results_path)
             _log.debug('Fetched try results to file "%s".', results_path)
             self._host.filesystem.remove(results_path)
         return json.loads(contents)
 
+    def is_closed(self):
+        out = self.run(['status' '--field', 'status'])
+        return out.strip() == 'closed'
+
     @staticmethod
     def all_jobs_finished(try_results):
         return all(r.get('status') == 'COMPLETED' for r in try_results)
 
     @staticmethod
     def has_failing_try_results(try_results):
         return any(r.get('result') == 'FAILURE' for r in try_results)