This CL shuffles quite a bit of code around, but the effective differences are:
* Unified shortcut updating code (language switch & backup restoration).
* Shortcuts are also updated on boot (flagged by MODES_UI which will need this).
* Removed usage of (long obsolete) AsyncTask.
A further CL will add some special-casing for the DND->Modes shortcut transition.
Bug: 365545604
Test: atest com.android.settings.shortcut + manual (switch language, reboot)
Flag: android.app.modes_ui
Change-Id: I30450d13cb05008d2a71ed89d4781eb81e5532b9
Add entrance for B&R accessibility appearance related settings.
Flag: com.android.settings.flags.accessibility_appearance_settings_backup_enabled
Bug: 349941894
Bug: 328585994
Test: manual, need to open aconfig flag.
Change-Id: I9617da947201def01f2cfd7f20ce3d11d65f882d
Add entrance for B&R sound related settings.
Bug: 278975761
Test: manual, need to open aconfig flag.
Change-Id: I5396e9e260aea1ece3a507ee322c73308f69f94a
Creating an no-op backup agent in settings. This ensures that
we get onRestoreFinished callback after restore is finished where we
can update all pinned shortcuts.
Bug: 110016648
Test: Verified backup->clear-data->restore path on device
Change-Id: Id14d0792d60ba08d97078a31a81d2b63ab8ce109
