The Los Angeles Chargers re-tooled the 53-man depth chart through free agency and the NFL draft in rather dramatic fashion. There are plenty of carryovers from last year, sure. But a big theme of the NFL draft for the Chargers was overhauling the offense to Mike McDaniels’ vision.  The new offensive coordinator's fingerprints were all over free-agency signings at every offensive position (even fullback) except wideout. Then in the draft, the Chargers went and got him one of those, too, plus four offensive linemen who fit his new blocking scheme’s needs.  It’s early, but here’s a look at a 53-man roster projection.  Post-NFL draft Chargers 53-man roster projection QB  (2) Justin Herbert Trey Lance No shockers here, the Chargers have one of the best backups in the NFL with Trey Lance.  RB  (4) Omarion Hampton Keaton Mitchell Kimani Vidal Alec Ingold (FB) The Chargers keep it light here, with free-agent addition Keaton Mitchell a strong rotational player.…