Use chromium revision instead of blink svn revision when rebaselining layout tests.

third_party/WebKit/Tools/Scripts/webkitpy/performance_tests/perftestsrunner.py

 # Copyright (C) 2012 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 244 matching lines @@
         template = filesystem.read_text_file(template_path)
 
         absolute_path_to_trunk = filesystem.dirname(self._port.perf_tests_dir())
         results_page = template.replace('%AbsolutePathToWebKitTrunk%', absolute_path_to_trunk)
         results_page = results_page.replace('%PeformanceTestsResultsJSON%', json_output)
 
         filesystem.write_text_file(self._results_page_path(), results_page)
 
     def _generate_results_dict(self, timestamp, description, platform, builder_name, build_number):
         revisions = {}
-        for (name, path) in self._port.repository_paths():
-            scm = SCMDetector(self._host.filesystem, self._host.executive).detect_scm_system(path) or self._host.scm()
-            revision = scm.svn_revision(path)
-            revisions[name] = {'revision': revision, 'timestamp': scm.timestamp_of_revision(path, revision)}
+        path = self._port.repository_path()
+        scm = SCMDetector(self._host.filesystem, self._host.executive).detect_scm_system(path) or self._host.scm()
+        revision = scm.commit_position(path)
+        revisions['chromium'] = {'revision': revision, 'timestamp': scm.timestamp_of_revision(path, revision)}
 
         meta_info = {
             'description': description,
             'buildTime': self._datetime_in_ES5_compatible_iso_format(self._utc_timestamp),
             'platform': platform,
             'revisions': revisions,
             'builderName': builder_name,
             'buildNumber': int(build_number) if build_number else None}
 
         contents = {'tests': {}}
@@ skipping 90 matching lines @@
             if metrics:
                 self._results.append((test, metrics))
             else:
                 failures += 1
                 _log.error('FAILED')
 
             _log.info('Finished: %f s' % (time.time() - start_time))
             _log.info('')
 
         return failures