W3C auto importer: Add a buildbot job link to CL description.

third_party/WebKit/Tools/Scripts/webkitpy/w3c/deps_updater.py

 # Copyright 2014 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.
 
 """Fetches a copy of the latest state of a W3C test repository and commits.
 
 If this script is given the argument --auto-update, it will also attempt to
 upload a CL, triggery try jobs, and make any changes that are required for
 new failing tests before committing.
 """
@@ skipping 308 matching lines @@
         if self.git_cl.has_failing_try_results(try_results):
             _log.info('CQ failed; aborting.')
             self.git_cl.run(['set-close'])
             return False
         _log.info('Update completed.')
         return True
 
     def _upload_cl(self):
         _log.info('Uploading change list.')
         cc_list = self.get_directory_owners_to_cc()
-        last_commit_message = self.check_run(['git', 'log', '-1', '--format=%B'])
-        commit_message = last_commit_message + 'TBR=qyearsley@chromium.org'
+        description = self._cl_description()
         self.git_cl.run([
             'upload',
             '-f',
             '--rietveld',
             '-m',
-            commit_message,
+            description,
         ] + ['--cc=' + email for email in cc_list])
 
+    def _cl_description(self):
+        description = self.check_run(['git', 'log', '-1', '--format=%B'])
+        build_link = self._build_link()
+        if build_link:
+            description += 'Build: %s\n\n' % build_link
+        description += 'TBR=qyearsley@chromium.org'
+        return description
+
+    def _build_link(self):
+        """Returns a link to a job, if running on buildbot."""
+        master_name = self.host.environ.get('BUILDBOT_MASTERNAME')
+        builder_name = self.host.environ.get('BUILDBOT_BUILDERNAME')
+        build_number = self.host.environ.get('BUILDBOT_BUILDNUMBER')
+        if not (master_name and builder_name and build_number):
+            return None
+        return 'https://build.chromium.org/p/%s/builders/%s/builds/%s' % (master_name, builder_name, build_number)
+
     def get_directory_owners_to_cc(self):
         """Returns a list of email addresses to CC for the current import."""
         _log.info('Gathering directory owners emails to CC.')
         directory_owners_file_path = self.finder.path_from_webkit_base(
             'Tools', 'Scripts', 'webkitpy', 'w3c', 'directory_owners.json')
         with open(directory_owners_file_path) as data_file:
             directory_to_owner = self.parse_directory_owners(json.load(data_file))
         out = self.check_run(['git', 'diff', 'origin/master', '--name-only'])
         changed_files = out.splitlines()
         return self.generate_email_list(changed_files, directory_to_owner)
@@ skipping 80 matching lines @@
         """Returns a dict mapping source to dest name for layout tests that have been renamed."""
         out = self.check_run(['git', 'diff', 'origin/master', '-M100%', '--diff-filter=R', '--name-status'])
         renamed_tests = {}
         for line in out.splitlines():
             _, source_path, dest_path = line.split()
             source_test = self.finder.layout_test_name(source_path)
             dest_test = self.finder.layout_test_name(dest_path)
             if source_test and dest_test:
                 renamed_tests[source_test] = dest_test
         return renamed_tests