Revert "0928-test-2"

This reverts commit e4e02e838bee04d83d0695b15366731f76cd864b.

Reason for revert:
test revert 691177

Original change's description:
> 0928-test-2
>
> Change-Id: I7ea9986fb121e3922a0fbdc77c142645f47ea482
> Reviewed-on: https://chromium-review.googlesource.com/691177
> Reviewed-by: Chan Li <chanli@chromium.org>

Change-Id: I60db489bd031ad10e3f13b2fa85975de90409180
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/691105
Reviewed-by: Chan Li <chanli@chromium.org>
diff --git a/wf_culprit.py b/wf_culprit.py
new file mode 100644
index 0000000..2322cd1
--- /dev/null
+++ b/wf_culprit.py
@@ -0,0 +1,40 @@
+# 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.
+
+from google.appengine.ext import ndb
+
+from model import analysis_status as status
+from model.base_suspected_cl import BaseSuspectedCL
+
+
+class WfCulprit(BaseSuspectedCL):
+  """Represents a culprit that causes a group of failures on Chromium waterfall.
+
+  'Wf' is short for waterfall.
+  """
+  # The list of builds in which the culprit caused some breakage.
+  builds = ndb.JsonProperty(indexed=False)
+
+  # When the code-review of this culprit was notified.
+  cr_notification_time = ndb.DateTimeProperty(indexed=True)
+
+  # The status of code-review notification: None, RUNNING, COMPLETED, ERROR.
+  cr_notification_status = ndb.IntegerProperty(indexed=True)
+
+  @property
+  def cr_notification_processed(self):
+    return self.cr_notification_status in (status.COMPLETED, status.RUNNING)
+
+  @property
+  def cr_notified(self):
+    return self.cr_notification_status == status.COMPLETED
+
+  @classmethod
+  def Create(cls, repo_name, revision, commit_position):  # pragma: no cover
+    instance = cls(key=cls._CreateKey(repo_name, revision))
+    instance.repo_name = repo_name
+    instance.revision = revision
+    instance.commit_position = commit_position
+    instance.builds = []
+    return instance
\ No newline at end of file