Use elapsed realtime instead of times based on wall clock, which can jump around and go backwards.

Test: statsd unit test passed

Change-Id: Ib541df99231e171b3be2a24f75632693e36da90e
diff --git a/tools/stats_log_api_gen/Android.bp b/tools/stats_log_api_gen/Android.bp
index e301eb1..dc2ed43 100644
--- a/tools/stats_log_api_gen/Android.bp
+++ b/tools/stats_log_api_gen/Android.bp
@@ -102,6 +102,7 @@
     export_generated_headers: ["statslog.h"],
     shared_libs: [
         "liblog",
+        "libutils",
     ],
 }