Create the harness and shell of update_test_expectations

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/models/test_expectations.py

 # Copyright (C) 2010 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 1019 matching lines @@
 
         self._has_warnings = False
         self._report_warnings()
         self._process_tests_without_expectations()
 
     # TODO(ojan): Allow for removing skipped tests when getting the list of
     # tests to run, but not when getting metrics.
     def model(self):
         return self._model
 
+    def expectations(self):
+        return self._expectations
+
     def get_needs_rebaseline_failures(self):
         return self._model.get_test_set(NEEDS_REBASELINE)
 
     def get_rebaselining_failures(self):
         return self._model.get_test_set(REBASELINE)
 
     # FIXME: Change the callsites to use TestExpectationsModel and remove.
     def get_expectations(self, test):
         return self._model.get_expectations(test)
 
@@ skipping 137 matching lines @@
             # If reconstitute_only_these is an empty list, we want to return original_string.
             # So we need to compare reconstitute_only_these to None, not just check if it's falsey.
             if reconstitute_only_these is None or expectation_line in reconstitute_only_these:
                 return expectation_line.to_string(test_configuration_converter)
             return expectation_line.original_string
 
         def nones_out(expectation_line):
             return expectation_line is not None
 
         return "\n".join(filter(nones_out, map(serialize, expectation_lines)))