Add migration tests for IS_PRIVATE column.

Test: atest LegacyProviderMigrationTest
Test: The above test fails without I86bdea2b8589a4c5ee11eaf73ae7aecd2a55d96a
Bug: 173374322
Change-Id: Ib837c543fceb16335e932529c9e9625f01940dab
3 files changed