Full JSON file has to be read instead of first line.

Tools/Scripts/webkitpy/layout_tests/generate_results_dashboard.py

 # Copyright (C) 2014 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 102 matching lines @@
     def _initialize(self):
         file_list = self._filesystem.listdir(self._results_directory_path)
         results_directories = []
         for dir in file_list:
             full_dir_path = self._filesystem.join(self._results_directory_path, dir)
             if self._filesystem.isdir(full_dir_path):
                 if self._results_directory in full_dir_path:
                     results_directories.append(full_dir_path)
         results_directories.sort(reverse=True, key=lambda x: self._filesystem.mtime(x))
         current_failing_results_json_file = self._filesystem.join(results_directories[0], 'failing_results.json')
-        with self._filesystem.open_text_file_for_reading(current_failing_results_json_file) as file:
-            input_json_string = file.readline()
+        input_json_string = self._filesystem.read_text_file(current_failing_results_json_file)
         input_json_string = input_json_string[12:-2]   # Remove preceeding string ADD_RESULTS( and ); at the end
         self._current_result_json_dict['tests'] = json.loads(input_json_string)['tests']
         results_directories = results_directories[1:]
 
         # To add hyperlink to individual results.html
         self._add_individual_result_links(results_directories)
 
         # Load the remaining stale layout test results Json's to create the dashboard
         for json_file in results_directories:
             failing_json_file_path = self._filesystem.join(json_file, 'failing_results.json')
             full_json_file_path = self._filesystem.join(json_file, 'full_results.json')
-            with self._filesystem.open_text_file_for_reading(failing_json_file_path) as file:
-                json_string = file.readline()
+            json_string = self._filesystem.read_text_file(failing_json_file_path)
             json_string = json_string[12:-2]   # Remove preceeding string ADD_RESULTS( and ); at the end
             self._old_failing_results_list.append(json.loads(json_string))
-
-            with self._filesystem.open_text_file_for_reading(full_json_file_path) as full_file:
-                json_string_full_result = full_file.readline()
+            json_string_full_result = self._filesystem.read_text_file(full_json_file_path)
             self._old_full_results_list.append(json.loads(json_string_full_result))
         self._copy_dashboard_html()
 
     def generate(self):
         self._initialize()
 
         # There must be atleast one archived result to be processed
         if self._current_result_json_dict:
             process_json_data = ProcessJsonData(self._current_result_json_dict, self._old_failing_results_list, self._old_full_results_list)
             self._final_result = process_json_data.generate_archived_result()
             final_json = json.dumps(self._final_result)
             final_json = 'ADD_RESULTS(' + final_json + ');'
             with self._filesystem.open_text_file_for_writing(self._filesystem.join(self._results_directory, 'archived_results.json')) as file:
                 file.write(final_json)