[Findit] Added algorithm to analysis

appengine/findit/model/base_analysis.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
 
 
 class BaseAnalysis(ndb.Model):
   """Represents a build analysis of a builder in a Chromium waterfall."""
 
   @property
   def completed(self):
     return self.status in (
         analysis_status.COMPLETED, analysis_status.ERROR)
 
   @property
   def duration(self):
     if not self.completed or not self.end_time or not self.start_time:
       return None
+
     return int((self.end_time - self.start_time).total_seconds())
 
   @property
   def failed(self):
     return self.status == analysis_status.ERROR
 
   @property
   def status_description(self):
     return analysis_status.STATUS_TO_DESCRIPTION.get(self.status, 'Unknown')
 
   # The url path to the pipeline status page.
   pipeline_status_path = ndb.StringProperty(indexed=False)
 
   # The status of the analysis.
   status = ndb.IntegerProperty(default=analysis_status.PENDING, indexed=False)
   # When the analysis was requested.
   request_time = ndb.DateTimeProperty(indexed=False)
   # When the analysis actually started.
   start_time = ndb.DateTimeProperty(indexed=False)
   # When the analysis actually ended.
   end_time = ndb.DateTimeProperty(indexed=False)
   # When the analysis was updated.
-  updated_time = ndb.DateTimeProperty(indexed=False, auto_now=True)
+  updated_time = ndb.DateTimeProperty(indexed=True, auto_now=True)
   # Record which version of analysis.
   version = ndb.StringProperty(indexed=False)