Make checkpointing work on ext4

Test: All tests pass
Change-Id: I2a6cdf1edfe752f4633e1931e75d18659653938c
diff --git a/VoldNativeService.h b/VoldNativeService.h
index 2282141..9a05b45 100644
--- a/VoldNativeService.h
+++ b/VoldNativeService.h
@@ -118,6 +118,7 @@
     binder::Status needsCheckpoint(bool* _aidl_return);
     binder::Status commitChanges(bool* _aidl_return);
     binder::Status prepareDriveForCheckpoint(const std::string& mountPoint, bool* _aidl_return);
+    binder::Status restoreCheckpoint(const std::string& mountPoint, bool* _aidl_return);
     binder::Status markBootAttempt(bool* __aidl_return);
     binder::Status abortChanges();
 };