Add boot sequence.

BUG=None
TEST=event_log_unittest.py

Change-Id: I656876dac988e4a68c48ad9395ba19dc76e12fe3
Reviewed-on: https://gerrit.chromium.org/gerrit/27624
Commit-Ready: Jon Salz <jsalz@chromium.org>
Tested-by: Jon Salz <jsalz@chromium.org>
Reviewed-by: Chun-Ta Lin <itspeter@chromium.org>
diff --git a/py/goofy/goofy.py b/py/goofy/goofy.py
index 484d7be..57260c0 100755
--- a/py/goofy/goofy.py
+++ b/py/goofy/goofy.py
@@ -34,6 +34,7 @@
 from cros.factory.test.event import Event
 from cros.factory.test.event import EventClient
 from cros.factory.test.event import EventServer
+from cros.factory import event_log
 from cros.factory.event_log import EventLog
 from cros.factory.goofy.invocation import TestInvocation
 from cros.factory.goofy.goofy_rpc import GoofyRPC
@@ -868,6 +869,7 @@
       factory.init_logging('goofy', verbose=self.options.verbose)
       _inited_logging = True
 
+    event_log.IncrementBootSequence()
     self.event_log = EventLog('goofy')
 
     if (not suppress_chroot_warning and