Mark json results failures as unexpected in python tests.

tools/telemetry/telemetry/unittest/json_results.py

Index: tools/telemetry/telemetry/unittest/json_results.py
diff --git a/tools/telemetry/telemetry/unittest/json_results.py b/tools/telemetry/telemetry/unittest/json_results.py
index 72c20f62ef11acc86d083e40825ad1023143244d..76a5c28ccb09f61186f309449376cacf0b419ac1 100644
--- a/tools/telemetry/telemetry/unittest/json_results.py
+++ b/tools/telemetry/telemetry/unittest/json_results.py
@@ -68,10 +68,14 @@ def _FullResults(suite, result, metadata):
   full_results['tests'] = {}
 
   for test_name in all_test_names:
-    value = {
-        'expected': 'PASS',
-        'actual': 'FAIL' if (test_name in failed_test_names) else 'PASS',
-    }
+    value = {}
+    value['expected'] = 'PASS'
+    if test_name in failed_test_names:
+      value['actual'] = 'FAIL'
+      value['is_unexpected'] = True
+    else:
+      value['actual'] = 'PASS'
+
     _AddPathToTrie(full_results['tests'], test_name, value)
 
   return full_results