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

appengine/findit/waterfall/build_util.py

 # 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.
 
 from datetime import datetime
 
 from common.http_client_appengine import HttpClientAppengine as HttpClient
 from model.wf_build import WfBuild
 from waterfall import buildbot
 from waterfall import lock_util
@@ skipping 37 matching lines @@
     if not build.data or not use_cbe:
       # Retrieve build data from build master.
       build.data = buildbot.GetBuildDataFromBuildMaster(
           master_name, builder_name, build_number, HTTP_CLIENT_LOGGING_ERRORS)
       build.data_source = BUILDBOT_MASTER
 
     build.last_crawled_time = datetime.utcnow()
     build.put()
 
   return build
+
+
+def GetBuildEndTime(master_name, builder_name, build_number):
+  build = DownloadBuildData(master_name, builder_name, build_number)
+  build_info = buildbot.ExtractBuildInfo(
+      master_name, builder_name, build_number, build.data)
+  return build_info.build_end_time