rebaseline_server: include setA/setB descriptions in output JSON

gm/rebaseline_server/compare_configs.py

 #!/usr/bin/python
 
 """
 Copyright 2014 Google Inc.
 
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 
 Compare GM results for two configs, across all builders.
 """
@@ skipping 30 matching lines @@
       configs: (string, string) tuple; pair of configs to compare
       actuals_root: root directory containing all actual-results.json files
       generated_images_root: directory within which to create all pixel diffs;
           if this directory does not yet exist, it will be created
       diff_base_url: base URL within which the client should look for diff
           images; if not specified, defaults to a "file:///" URL representation
           of generated_images_root
       builder_regex_list: List of regular expressions specifying which builders
           we will process. If None, process all builders.
     """
+    super(ConfigComparisons, self).__init__()
     time_start = int(time.time())
     if builder_regex_list != None:
       self.set_match_builders_pattern_list(builder_regex_list)
     self._image_diff_db = imagediffdb.ImageDiffDB(generated_images_root)
     self._diff_base_url = (
         diff_base_url or
         url_utils.create_filepath_url(generated_images_root))
     self._actuals_root = actuals_root
     self._load_config_pairs(configs)
     self._timestamp = int(time.time())
@@ skipping 137 matching lines @@
   results_obj = ConfigComparisons(configs=args.config,
                                   actuals_root=args.actuals,
                                   generated_images_root=args.workdir)
   gm_json.WriteToFile(
       results_obj.get_packaged_results_of_type(results_type=args.results),
       args.outfile)
 
 
 if __name__ == '__main__':
   main()