Persist data to disk when system shuts down

Test: local test

BUG: b/112432890

Change-Id: Iaed318671a719cc366d4e6be9f77270147ba6596
diff --git a/cmds/statsd/src/stats_log.proto b/cmds/statsd/src/stats_log.proto
index ab0b23c..10ed7f3 100644
--- a/cmds/statsd/src/stats_log.proto
+++ b/cmds/statsd/src/stats_log.proto
@@ -271,6 +271,7 @@
       ADB_DUMP = 5;
       CONFIG_RESET = 6;
       STATSCOMPANION_DIED = 7;
+      TERMINATION_SIGNAL_RECEIVED = 8;
   }
   optional DumpReportReason dump_report_reason = 8;