trace_processor: Add smoke tests for json importer

Change-Id: I206c8c3b1b8b87f297fb73d4802afe13c7873e3f
diff --git a/test/trace_processor/index b/test/trace_processor/index
index 6854209..a8f1ea6 100644
--- a/test/trace_processor/index
+++ b/test/trace_processor/index
@@ -1 +1,3 @@
 ../data/android_sched_and_ps.pb smoke.sql android_sched_and_ps_smoke.out
+../data/sfgate.json smoke.sql sfgate_smoke.out
+../data/sfgate.json smoke_slices.sql sfgate_smoke_slices.out