Sync: Small refactoring of Directory::CheckTreeInvariants

sync/internal_api/public/base/model_type.h

Index: sync/internal_api/public/base/model_type.h
diff --git a/sync/internal_api/public/base/model_type.h b/sync/internal_api/public/base/model_type.h
index 8695d8e07cf15314f299b1a7d5ef2dc9b7ebcc18..2bba5d56fd85303559815aae8b07fecded1b77fe 100644
--- a/sync/internal_api/public/base/model_type.h
+++ b/sync/internal_api/public/base/model_type.h
@@ -331,6 +331,10 @@ SYNC_EXPORT bool IsActOnceDataType(ModelType model_type);
 // created on the server during initial sync.
 SYNC_EXPORT bool IsTypeWithServerGeneratedRoot(ModelType model_type);
 
+// Returns true if root folder for |model_type| is created on the client when
+// that type is initially synced.
+SYNC_EXPORT bool IsTypeWithClientGeneratedRoot(ModelType model_type);
+
 // Returns set of model types that should be backed up before first sync.
 SYNC_EXPORT ModelTypeSet BackupTypes();