The FillResponse was automatically adding the AutofillId of all Datasets to the SaveInfo object, but that would cause problems when the AutofillService is not able to save some data (for example, if it comes from a read-only backend). Bug: 36076444 Test: OptionalSaveActivityTest pass Test: m update-api Change-Id: I1d5faaddf29e1be0f357438c8485e07caf975293