Update Dartium status for flaky polymer tests

pkg/pkg.status

Index: pkg/pkg.status
diff --git a/pkg/pkg.status b/pkg/pkg.status
index 761516bd9bbe67febfdba5bb8065e0bbbd5bb056..5201dbb5f6bd802cb28d55c36b92fffadb03e24c 100644
--- a/pkg/pkg.status
+++ b/pkg/pkg.status
@@ -33,7 +33,7 @@ polymer/test/custom_event_test: Pass, RuntimeError # Issue 18931
 polymer/test/entered_view_test: Pass, RuntimeError # Issue 18931
 polymer/test/event_handlers_test: Pass, RuntimeError # Issue 18931
 polymer/test/event_path_test: Pass, RuntimeError # Issue 18931
-polymer/test/event_path_declarative_test: Pass, RuntimeError # Issue 18931
+polymer/test/event_path_declarative_test: Pass, RuntimeError, Timeout # Issue 18931
 polymer/test/events_test: Pass, RuntimeError # Issue 18931
 polymer/test/instance_attrs_test: Pass, RuntimeError # Issue 18931
 polymer/test/js_custom_event_test: Pass, RuntimeError # Issue 18931
@@ -42,6 +42,7 @@ polymer/test/nested_binding_test: Pass, RuntimeError # Issue 18931
 polymer/test/noscript_test: Pass, RuntimeError # Issue 18931
 polymer/test/prop_attr_bind_reflection_test: Pass, RuntimeError # Issue 18931
 polymer/test/prop_attr_reflection_test: Pass, RuntimeError # Issue 18931
+polymer/test/property_change_test: Pass, Timeout # Issue 18931
 polymer/test/publish_attributes_test: Pass, RuntimeError # Issue 18931
 polymer/test/publish_inherited_properties_test: Pass, RuntimeError # Issue 18931
 polymer/test/register_test: Pass, RuntimeError # Issue 18931