[Findit] Add skeleton code for delta test script.

appengine/findit/util_scripts/crash_queries/delta_test/run-predator.py

Index: appengine/findit/util_scripts/crash_queries/delta_test/run-predator.py
diff --git a/appengine/findit/util_scripts/crash_queries/delta_test/run-predator.py b/appengine/findit/util_scripts/crash_queries/delta_test/run-predator.py
new file mode 100644
index 0000000000000000000000000000000000000000..aaa62d88489f2acbd0de2239238719beac34bf37
--- /dev/null
+++ b/appengine/findit/util_scripts/crash_queries/delta_test/run-predator.py
@@ -0,0 +1,60 @@
+# Copyright 2016 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.
+
+import argparse
+import json
+import logging
+import os
+import sys
+
+_SCRIPT_DIR = os.path.join(os.path.dirname(__file__), os.path.pardir,
+                           os.path.pardir)
+sys.path.insert(1, _SCRIPT_DIR)
+
+import script_util
+script_util.SetUpSystemPaths()
+
+from crash.findit_for_chromecrash import Culprit
+from crash_queries.delta_test import delta_util
+
+
+# TODO(katesonia): Replace the current testing function with real find culprit
+# function.
+def GetCulprits(crashes):
+  culprits = {}
+  for crash in crashes:
+    culprit = Culprit('proj', 'comp', [], ['rev1', 'rev2'])
+    culprits[crash['id']] = culprit
+
+  return culprits
+
+
+def RunPredator():
+  """Runs delta testing between 2 different Findit versions."""
+  argparser = argparse.ArgumentParser(
+      description='Run azalea on a batch of crashes.')
+  argparser.add_argument('result_path', help='Path to store results')
+  argparser.add_argument(
+      '--verbose',
+      '-v',
+      action='store_true',
+      default=False,
+      help='Print findit results.')
+  argparser.add_argument(
+      '--client',
+      '-c',
+      default='fracas',
+      help=('Possible values are: fracas, cracas, clusterfuzz. Right now, only '
+            'fracas is supported.'))
+  args = argparser.parse_args()
+
+  crashes = json.loads(raw_input())
+  culprits = GetCulprits(crashes)
+
+  delta_util.FlushResult(culprits, args.result_path)
+
+
+if __name__ == '__main__':
+  logging.basicConfig(level=logging.DEBUG)
+  RunPredator()