accounts via id also, not just real account

common/proto/tables_data.proto

@@ -203,6 +203,11 @@ message StageTableDataImportRequest {
   int64 expected_table_revision = 4;
 }
 
+enum ImportAccountMatch {
+  IMPORT_ACCOUNT_MATCH_PATH = 0;
+  IMPORT_ACCOUNT_MATCH_ID = 1;
+}
+
 message TableDataImportRow {
   // Required. Data payload for one staged row.
   map<string, google.protobuf.Value> data = 1;
@@ -210,6 +215,7 @@ message TableDataImportRow {
   // row display value, including text made only of digits. Unlisted columns
   // retain the normal table-write link semantics.
   repeated string link_display_columns = 2;
+  ImportAccountMatch account_match = 3;
 }
 
 message StageTableDataImportResponse {