Add return values to SyncerCommand

chrome/browser/sync/engine/apply_updates_command.cc

Index: chrome/browser/sync/engine/apply_updates_command.cc
diff --git a/chrome/browser/sync/engine/apply_updates_command.cc b/chrome/browser/sync/engine/apply_updates_command.cc
index 70ff1434d4beb22608974bd147ece10e02ebb7d1..88ee3c23edb70c84f4ac8fb485f1056fb8c95971 100644
--- a/chrome/browser/sync/engine/apply_updates_command.cc
+++ b/chrome/browser/sync/engine/apply_updates_command.cc
@@ -44,12 +44,13 @@ std::set<ModelSafeGroup> ApplyUpdatesCommand::GetGroupsToChange(
   return groups_with_unapplied_updates;
 }
 
-void ApplyUpdatesCommand::ModelChangingExecuteImpl(SyncSession* session) {
+SyncerError ApplyUpdatesCommand::ModelChangingExecuteImpl(
+    SyncSession* session) {
   syncable::ScopedDirLookup dir(session->context()->directory_manager(),
                                 session->context()->account_name());
   if (!dir.good()) {
     LOG(ERROR) << "Scoped dir lookup failed!";
-    return;
+    return DIRECTORY_LOOKUP_FAILED;
   }
 
   syncable::WriteTransaction trans(FROM_HERE, syncable::SYNCER, dir);
@@ -91,6 +92,8 @@ void ApplyUpdatesCommand::ModelChangingExecuteImpl(SyncSession* session) {
       dir->set_initial_sync_ended_for_type(it.Get(), true);
     }
   }
+
+  return NO_ERROR;
 }
 
 }  // namespace browser_sync