Rietveld: Display the remote tracked ref in both old and new UIs

appengine/chromium_rietveld/codereview/models.py

 # Copyright 2008 Google Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 59 matching lines @@
   """The major top-level entity.
 
   It has one or more PatchSets as its descendants.
   """
 
   subject = ndb.StringProperty(required=True)
   description = ndb.TextProperty()
   project = ndb.StringProperty()
   #: in Subversion - repository path (URL) for files in patch set
   base = ndb.StringProperty()
+  target_ref = ndb.StringProperty()
   repo_guid = ndb.StringProperty()
   owner = auth_utils.AnyAuthUserProperty(auto_current_user_add=True,
                                          required=True)
   created = ndb.DateTimeProperty(auto_now_add=True)
   modified = ndb.DateTimeProperty(auto_now=True)
   reviewers = ndb.StringProperty(repeated=True)
   required_reviewers = ndb.StringProperty(repeated=True)
   all_required_reviewers_approved = ndb.BooleanProperty(default=True)
   cc = ndb.StringProperty(repeated=True)
   closed = ndb.BooleanProperty(default=False)
@@ skipping 1685 matching lines @@
   out.issues = sum((i.issues for i in items), [])
   out.latencies = sum((i.latencies for i in items), [])
   out.lgtms = sum((i.lgtms for i in items), [])
   out.review_types = sum((i.review_types for i in items), [])
   out.score = compute_score(out)
   return (
       prev_issues != out.issues or
       prev_latencies != out.latencies or
       prev_lgtms != out.lgtms or
       prev_review_types != out.review_types)