Fetch retry summary and use it to determine what tests to rebaseline.

third_party/WebKit/Tools/Scripts/webkitpy/common/net/buildbot_mock.py

 # Copyright (C) 2011 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 22 matching lines @@
 
 # TODO(qyearsley): Instead of canned results from another module, other unit
 # tests may be a little easier to understand if this returned None by default
 # when there are no canned results to return.
 class MockBuildBot(BuildBot):
 
     def __init__(self):
         super(MockBuildBot, self).__init__()
         # Dict of Build to canned LayoutTestResults.
         self._canned_results = {}
+        self._canned_retry_summary_json = {}
 
     def fetch_layout_test_results(self, _):
         return LayoutTestResults.results_from_string(LayoutTestResultsTest.example_full_results_json)
 
     def set_results(self, build, results):
         self._canned_results[build] = results
 
     def fetch_results(self, build):
         return self._canned_results.get(
             build,
             LayoutTestResults.results_from_string(LayoutTestResultsTest.example_full_results_json))
+
+    def set_retry_sumary_json(self, build, content):
+        self._canned_retry_summary_json[build] = content
+
+    def fetch_retry_summary_json(self, build):
+        return self._canned_retry_summary_json.get(build)