AU: Implement switching of tracks through SetTrack.

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>
 
 #include "update_engine/marshal.glibmarshal.h"
+#include "update_engine/omaha_request_params.h"
 #include "update_engine/utils.h"
 
 using std::string;
 
 G_DEFINE_TYPE(UpdateEngineService, update_engine_service, G_TYPE_OBJECT)
 
 static void update_engine_service_finalize(GObject* object) {
   G_OBJECT_CLASS(update_engine_service_parent_class)->finalize(object);
 }
 
@@ skipping 82 matching lines @@
     *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;
+    LOG(INFO) << "Setting track to: " << track;
+    if (!chromeos_update_engine::OmahaRequestDeviceParams::SetDeviceTrack(
+            track)) {
+      *error = NULL;
+      return FALSE;
+    }
   }
   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;
 }