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This CL ensures that Restore works correctly (to unblock us for ODR system image). As restore happens on the system image and the logic cannot be updated via PlayStore, this CL is time sensitive, to ensure we can get it into the ODR system drop. This CL only backups com.android.dialer.app_preferences.xml for now, but can always be changed to update more shared preference files when needed via an playstore update. Since we are using PersistentBackupAgentHelper, we don't have to worry about not being able to restore additional backed up shared preference files from the future, as PersistentBackupAgentHelper will allow us to restore all the shared preferences that were ever backed up via Key/Value.
Currently I added an end to end unit test, and tested restore via "adb shell bmgr restore com.google.android.dialer", which restored the stored data sets. A follow up CL will include additional files to backup and impression logging.
Bug: 64363054
Test: DialerPersistentBackupAgentTest
PiperOrigin-RevId: 164524465
Change-Id: I5bd65215a42744ba4149a9359e443679306b6cc0
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