Add a reason for configuring DTM for backup/rollback. In backup/rollback,

chrome/browser/sync/glue/data_type_manager_impl_unittest.cc

Index: chrome/browser/sync/glue/data_type_manager_impl_unittest.cc
diff --git a/chrome/browser/sync/glue/data_type_manager_impl_unittest.cc b/chrome/browser/sync/glue/data_type_manager_impl_unittest.cc
index 8046a01220954938034093ae1e41c3e1a5809adb..01da243067b61701327e8e112ccd7cf6a628a99f 100644
--- a/chrome/browser/sync/glue/data_type_manager_impl_unittest.cc
+++ b/chrome/browser/sync/glue/data_type_manager_impl_unittest.cc
@@ -1114,4 +1114,19 @@ TEST_F(SyncDataTypeManagerImplTest, FilterDesiredTypes) {
   EXPECT_EQ(DataTypeManager::STOPPED, dtm_->state());
 }
 
+TEST_F(SyncDataTypeManagerImplTest, ConfigureForBackupRollback) {
+  AddController(BOOKMARKS);
+
+  SetConfigureStartExpectation();
+
+
+  ModelTypeSet expected_types = syncer::ControlTypes();
+  expected_types.Put(BOOKMARKS);
+  configurer_.set_expected_configure_types(expected_types);
+  dtm_->set_priority_types(expected_types);
+
+  dtm_->Configure(ModelTypeSet(BOOKMARKS),
+                  syncer::CONFIGURE_REASON_BACKUP_ROLLBACK);
+}
+
 }  // namespace browser_sync