AU: Provide a D-Bus API for changing the update track.

dbus_service.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 "update_engine/dbus_service.h"
 
 #include <string>
 
 #include <base/logging.h>
 
@@ skipping 89 matching lines @@
 
 gboolean update_engine_service_reboot_if_needed(UpdateEngineService* self,
                                                 GError **error) {
   if (!self->update_attempter_->RebootIfNeeded()) {
     *error = NULL;
     return FALSE;
   }
   return TRUE;
 }
 
+gboolean update_engine_service_set_track(UpdateEngineService* self,
+                                         gchar* track,
+                                         GError **error) {
+  if (track) {
+    LOG(INFO) << "TODO: Setting track to: " << track;
+  }
+  return TRUE;
+}
+
 gboolean update_engine_service_emit_status_update(
     UpdateEngineService* self,
     gint64 last_checked_time,
     gdouble progress,
     const gchar* current_operation,
     const gchar* new_version,
     gint64 new_size) {
   g_signal_emit(self,
                 status_update_signal,
                 0,
                 last_checked_time,
                 progress,
                 current_operation,
                 new_version,
                 new_size);
   return TRUE;
 }