Add 10 minute random fuzz to automatic update check event schedule.

testrunner.cc

 // Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // based on pam_google_testrunner.cc
 
 #include <dbus/dbus-glib.h>
 #include <dbus/dbus-glib-bindings.h>
 #include <dbus/dbus-glib-lowlevel.h>
 #include <glib.h>
 #include <glib-object.h>
 #include <gtest/gtest.h>
+#include "base/at_exit.h"
 #include "base/command_line.h"
 #include "update_engine/subprocess.h"
 
 int main(int argc, char **argv) {
   ::g_type_init();
   g_thread_init(NULL);
   dbus_g_thread_init();
+  base::AtExitManager exit_manager;
   chromeos_update_engine::Subprocess::Init();
   CommandLine::Init(argc, argv);
   ::testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
 }