Add StatsdStats and guardrail.

+ StatsdStats is the global class that tracks the stats about statsd.

+ Added guardrail for classes that have a map which could potentially grow
  unboundedly with the number of logs.

TODO: add unit tests & CTS for StatsdStats, and guardrail
      add stats for pulled atoms.

Test: statsd_test

Change-Id: I0ea562de4dd3f6162f7923a9c193420b482c1d51
diff --git a/cmds/statsd/src/StatsService.h b/cmds/statsd/src/StatsService.h
index 6b5c156..a32595a 100644
--- a/cmds/statsd/src/StatsService.h
+++ b/cmds/statsd/src/StatsService.h
@@ -134,7 +134,7 @@
     /**
      * Prints some basic stats to std out.
      */
-    status_t cmd_print_stats(FILE* out);
+    status_t cmd_print_stats(FILE* out, const Vector<String8>& args);
 
     /**
      * Print the event log.