Rename "stats_events" as "atom".

Also make atom WakelockStateChanged use the "Type" enum instead of int32.

Test: Unittests are passing. Statsd is working.

Change-Id: I0909e2d97297f78996a81366d66aae62d5bf5ce1
diff --git a/cmds/statsd/src/StatsLogProcessor.cpp b/cmds/statsd/src/StatsLogProcessor.cpp
index 8c70bb5..b764ce5 100644
--- a/cmds/statsd/src/StatsLogProcessor.cpp
+++ b/cmds/statsd/src/StatsLogProcessor.cpp
@@ -66,7 +66,7 @@
     }
 
     // Hard-coded logic to update the isolated uid's in the uid-map.
-    // The field numbers need to be currently updated by hand with stats_events.proto
+    // The field numbers need to be currently updated by hand with atoms.proto
     if (msg.GetTagId() == android::util::ISOLATED_UID_CHANGED) {
         status_t err = NO_ERROR, err2 = NO_ERROR, err3 = NO_ERROR;
         bool is_create = msg.GetBool(3, &err);