[Findit] Adding data model for capturing check flake analysis metadata

appengine/findit/model/base_swarming_task.py

Index: appengine/findit/model/base_swarming_task.py
diff --git a/appengine/findit/model/base_swarming_task.py b/appengine/findit/model/base_swarming_task.py
index d74c9851e0161ec9d64bc23590cf610b4a21ba18..3cbbe7afc232c89e10b64b365892079245dc1cc6 100644
--- a/appengine/findit/model/base_swarming_task.py
+++ b/appengine/findit/model/base_swarming_task.py
@@ -6,6 +6,7 @@ from google.appengine.ext import ndb
 
 from model import analysis_status
 
+
 class BaseSwarmingTask(ndb.Model):
   """Represents the progress of a general swarming task."""
   # The id of the Swarming task scheduled or running on Swarming Server.
@@ -19,6 +20,14 @@ class BaseSwarmingTask(ndb.Model):
   status = ndb.IntegerProperty(
       default=analysis_status.PENDING, indexed=False)
 
+  # An error dict containing an error code and message should this task fail
+  # unexpectedly. For example:
+  # {
+  #     'code': 1,
+  #     'message': 'Timed out'
+  # }
+  error = ndb.JsonProperty(indexed=False)
+
   # The revision of the failed build.
   build_revision = ndb.StringProperty(indexed=False)