autotest: generate a report of a suite job run

BUG=chromium:641093
TEST=verify data is viewable via datastore

Change-Id: Ib08da5ce438b120e67296966aff8bdde52815dca
Reviewed-on: https://chromium-review.googlesource.com/386993
Commit-Ready: Aviv Keshet <akeshet@chromium.org>
Tested-by: David Riley <davidriley@chromium.org>
Reviewed-by: David Riley <davidriley@chromium.org>
diff --git a/server/lib/status_history.py b/server/lib/status_history.py
index 0adfea5..0b26d2e 100755
--- a/server/lib/status_history.py
+++ b/server/lib/status_history.py
@@ -357,9 +357,11 @@
     for remembering the query results for reporting.
 
     @property hostname    Host name of the DUT.
-    @property start_time  Start of the requested time interval.
+    @property start_time  Start of the requested time interval, as a unix
+                          timestamp (epoch time).
                           This field may be `None`.
-    @property end_time    End of the requested time interval.
+    @property end_time    End of the requested time interval, as a unix
+                          timestamp (epoch time).
     @property _afe        Autotest frontend for queries.
     @property _host       Database host object for the DUT.
     @property _history    A list of jobs and special tasks that