[autotest] Restore tko result database frontend.

A change to a shared file between afe and tko broke tko.

BUG=chromium:386768
TEST=ran tko
DEPLOY=tko (./utils/compile_gwt_clients.py -c autotest.TkoClient), apache

Change-Id: I5b39919758ab622c4b66dc3375593fa90ea0114f
Reviewed-on: https://chromium-review.googlesource.com/204748
Reviewed-by: Alex Miller <milleral@chromium.org>
Commit-Queue: Jiaxi Luo <jiaxiluo@chromium.org>
Tested-by: Jiaxi Luo <jiaxiluo@chromium.org>
diff --git a/frontend/tko/rpc_interface.py b/frontend/tko/rpc_interface.py
index f695675..213eb40 100644
--- a/frontend/tko/rpc_interface.py
+++ b/frontend/tko/rpc_interface.py
@@ -1,5 +1,6 @@
 import os, pickle, datetime, itertools, operator
 from django.db import models as dbmodels
+from autotest_lib.client.common_lib import priorities
 from autotest_lib.frontend.afe import rpc_utils, model_logic
 from autotest_lib.frontend.afe import models as afe_models, readonly_connection
 from autotest_lib.frontend.tko import models, tko_rpc_utils, graphing_utils
@@ -430,6 +431,7 @@
         ['Performance Keyval (Value)', 'iteration_value'],
     ]
 
+    result['priorities'] = priorities.Priority.choices()
     result['group_fields'] = sorted(group_fields)
     result['all_fields'] = sorted(model_fields + extra_fields)
     result['test_labels'] = get_test_labels(sort_by=['name'])