Add support to update_engine_client for -app_version and -omaha_url.

main.cc

 // Copyright (c) 2010 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.
 
 #include <string>
 #include <tr1/memory>
 #include <vector>
 
 #include <gflags/gflags.h>
 #include <glib.h>
@@ skipping 22 matching lines @@
 
 namespace {
 
 struct PeriodicallyUpdateArgs {
   UpdateAttempter* update_attempter;
   gboolean should_repeat;
 };
 
 gboolean PeriodicallyUpdate(void* arg) {
   PeriodicallyUpdateArgs* args = reinterpret_cast<PeriodicallyUpdateArgs*>(arg);
-  args->update_attempter->Update();
+  args->update_attempter->Update("", "");
   return args->should_repeat;
 }
 
 void SetupDbusService(UpdateEngineService* service) {
   DBusGConnection *bus;
   DBusGProxy *proxy;
   GError *error = NULL;
 
   bus = dbus_g_bus_get(DBUS_BUS_SYSTEM, &error);
   if (!bus) {
@@ skipping 84 matching lines @@
   g_main_loop_run(loop);
 
   // Cleanup:
   g_main_loop_unref(loop);
   update_attempter.set_dbus_service(NULL);
   g_object_unref(G_OBJECT(service));
 
   LOG(INFO) << "Chrome OS Update Engine terminating";
   return 0;
 }