trace_processor: add tests for new args table

This CL adds tests for the new args table by adding a new test trace
which has memory counters. Both the args table itself as well as joining
with the counters table are tested.

Change-Id: Ie78342effd59667258d80021885136e392bc4038
diff --git a/test/trace_processor/index b/test/trace_processor/index
index 81dbe9f..4986b9f 100644
--- a/test/trace_processor/index
+++ b/test/trace_processor/index
@@ -6,6 +6,8 @@
 ../data/android_sched_and_ps.pb b119301023.sql android_sched_and_ps_b119301023.out
 ../data/android_sched_and_ps.pb stats.sql android_sched_and_ps_stats.out
 ../data/android_sched_and_ps.pb b119496959.sql android_sched_and_ps_b119496959.out
+../data/memory_counters.pb smoke_args.sql memory_counters_smoke_args.out
+../data/memory_counters.pb counter_args_join.sql memory_counters_counter_args_join.out
 synth_1.py smoke.sql synth_1_smoke.out
 synth_1.py filter_sched.sql synth_1_filter_sched.out
 synth_1.py filter_counters.sql synth_1_filter_counters.out