The Chargers are adding a top-notch blocker to their tight end room. But they are also losing a starting guard. The club has agreed to terms on a free agent contract with former Raven’s tight end Charlie Kolar. The deal is for a reported  $24 million over three years with $17 million guaranteed. Meanwhile, a source with knowledge of the situation confirmed that guard Zion Johnson  reached an agreement with the Cleveland Browns on a three-year deal with $49.5 million, including $32.4 million