more GDPR classification

src/vs/workbench/api/electron-browser/mainThreadSaveParticipant.ts

@@ -266,6 +266,11 @@ export class SaveParticipant implements ISaveParticipant {
 		});
 
 		return sequence(promiseFactory).then(() => {
+			/* __GDPR__
+			   "saveParticipantStats" : {
+			   }
+			 */
+			// TODO: We need to move off dynamic property names as we can't declare them statically in the registry.
 			this._telemetryService.publicLog('saveParticipantStats', stats);
 		});
 	}