Merge "bootstat: Calculate and log the time_since_last_boot metric."
am: 1607ea6

* commit '1607ea64cbdeea766c05d033afe0c65ea978b399':
  bootstat: Calculate and log the time_since_last_boot metric.

Change-Id: I643c0847a75e4ba02db17ea5e4c716f6fcc7b28d
diff --git a/bootstat/bootstat.cpp b/bootstat/bootstat.cpp
index 976ba66..7c1b7f3 100644
--- a/bootstat/bootstat.cpp
+++ b/bootstat/bootstat.cpp
@@ -205,7 +205,19 @@
 void RecordBootComplete() {
   BootEventRecordStore boot_event_store;
   BootEventRecordStore::BootEventRecord record;
+
   time_t uptime = bootstat::ParseUptime();
+  time_t current_time_utc = time(nullptr);
+
+  if (boot_event_store.GetBootEvent("last_boot_time_utc", &record)) {
+    time_t last_boot_time_utc = record.second;
+    time_t time_since_last_boot = difftime(current_time_utc,
+                                           last_boot_time_utc);
+    boot_event_store.AddBootEventWithValue("time_since_last_boot",
+                                           time_since_last_boot);
+  }
+
+  boot_event_store.AddBootEventWithValue("last_boot_time_utc", current_time_utc);
 
   // The boot_complete metric has two variants: boot_complete and
   // ota_boot_complete.  The latter signifies that the device is booting after