Adding ability to bisect recipe to bisect into dependency repos.

scripts/slave/recipe_modules/auto_bisect/test_results_cache.py

Index: scripts/slave/recipe_modules/auto_bisect/test_results_cache.py
diff --git a/scripts/slave/recipe_modules/auto_bisect/test_results_cache.py b/scripts/slave/recipe_modules/auto_bisect/test_results_cache.py
new file mode 100644
index 0000000000000000000000000000000000000000..b393e2a5b9153d1ad6db71cb664788ace5c9ea4b
--- /dev/null
+++ b/scripts/slave/recipe_modules/auto_bisect/test_results_cache.py
@@ -0,0 +1,53 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+"""Local testing cache for test results.
+
+The purpose of these functions is for the bisector to save some state between
+runs. Specifically, it is meant to save the results of running a specific test
+on a specific revision so that further bisections requiring them do not trigger
+a new test job every time.
+"""
+
+import hashlib
+import json
+import os
+import sys
+
+resultset_file = '/tmp/bisect/test_results_cache'
+
+def make_id(*params):# pragma: no cover
+  id_string = json.dumps(params)
+  return hashlib.sha1(id_string).hexdigest()
+
+def has_results(name):# pragma: no cover
+  return name in _get_result_set()
+
+def save_results(name, value):# pragma: no cover
+  rs = _get_result_set()
+  rs[name] = value
+  _write_result_set(rs)
+
+def _get_result_set():# pragma: no cover
+  if os.path.isfile(resultset_file):
+    contents = open(resultset_file).read()
+    resultset = json.loads(contents)
+    return resultset
+  else:
+    return {}
+
+def _write_result_set(resultset):  # pragma: no cover
+  _dir = os.path.dirname(resultset_file)
+  if not os.path.exists(_dir):
+    os.mkdir(_dir)
+  with open(resultset_file, 'w') as of:
+    contents = json.dumps(resultset)
+    of.write(json.dumps(resultset))
+
+def main():  # pragma: no cover
+  some_id = make_id('dummy_string')
+  if not has_results(some_id):
+    save_results(some_id, 'dummy_value')
+
+if __name__ == '__main__':
+  sys.exit(main())   # pragma: no cover