Add flag com.android.window.flags.migrate_basic_legacy_ready to trunk_staging. This change was automatically created by advancing the Gantry workflow at: https://releasetracker.partner.android.com/changes/84at4vq000001?build_unique_id=com.android.window.flags.migrate_basic_legacy_ready-platform Do not edit this file manually or revert this change - use the Gantry workflow to manage the state of this flag. Bug: 294925498 Flag: com.android.window.flags.migrate_basic_legacy_ready Ignore-AOSP-First: AConfig change for future AOSP release Change-Id: Ic19dc03310f7c0810eeb28a26550a99beb4cbca7