[Sync] Make BackendMigrator not wait for full sync cycles

chrome/browser/sync/glue/sync_backend_registrar.cc

Index: chrome/browser/sync/glue/sync_backend_registrar.cc
diff --git a/chrome/browser/sync/glue/sync_backend_registrar.cc b/chrome/browser/sync/glue/sync_backend_registrar.cc
index 9e9b83e1bcbaec523f10b810f710a88e3bb24f74..945e2f1659652eac6f79df591ae8c3d63ca907c2 100644
--- a/chrome/browser/sync/glue/sync_backend_registrar.cc
+++ b/chrome/browser/sync/glue/sync_backend_registrar.cc
@@ -137,6 +137,15 @@ syncable::ModelTypeSet SyncBackendRegistrar::ConfigureDataTypes(
        it != types_to_remove.end(); ++it) {
     routing_info_.erase(*it);
   }
+
+  VLOG(1) << "Adding types " << syncable::ModelTypeSetToString(types_to_add)
+          << " (with newly-added types "
+          << syncable::ModelTypeSetToString(newly_added_types)
+          << ") and removing types "
+          << syncable::ModelTypeSetToString(types_to_remove)
+          << " to get new routing info "
+          << ModelSafeRoutingInfoToString(routing_info_);
+
   return newly_added_types;
 }