[Findit] Fix redirect bug and update template for waterfall/culprit.

appengine/findit/model/wf_culprit.py

 # 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
 
 
 class WfCulprit(ndb.Model):
   """Represents a culprit that causes a group of failures on Chromium waterfall.
 
   'Wf' is short for waterfall.
   """
 
   # Repo or project name of the culprit, eg: chromium, etc.
   repo_name = ndb.StringProperty(indexed=True)
 
   # The Git hash revision of the culprit.
   revision = ndb.StringProperty(indexed=False)
 
+  # The commit position of the culprit. Might not be available for some repo.
+  commit_position = ndb.IntegerProperty(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)
 
   # The list of builds in which the culprit caused some breakage.
   builds = ndb.JsonProperty(indexed=False)
 
   @property
   def project_name(self):
     return self.repo_name
 
   @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 _CreateKey(cls, repo_name, revision):  # pragma: no cover
     return ndb.Key(cls.__name__, '%s/%s' % (repo_name, revision))
 
   @classmethod
-  def Create(cls, repo_name, revision):  # pragma: no cover
+  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
 
   @classmethod
   def Get(cls, repo_name, revision):  # pragma: no cover
     return cls._CreateKey(repo_name, revision).get()