tp: Find previous runnable slice on thread.

Change-Id: I221972530cb1923e3772c35e9133c93d1b982ee0
diff --git a/BUILD b/BUILD
index d678720..626bceb 100644
--- a/BUILD
+++ b/BUILD
@@ -2528,6 +2528,7 @@
 perfetto_filegroup(
     name = "src_trace_processor_perfetto_sql_stdlib_sched_sched",
     srcs = [
+        "src/trace_processor/perfetto_sql/stdlib/sched/runnable.sql",
         "src/trace_processor/perfetto_sql/stdlib/sched/states.sql",
         "src/trace_processor/perfetto_sql/stdlib/sched/thread_executing_span.sql",
         "src/trace_processor/perfetto_sql/stdlib/sched/thread_level_parallelism.sql",