Open this photo in gallery: U.S. Ambassador to Japan George Glass, second left, and his wife Mary, left, are welcomed upon their arrival at Haneda Airport in Tokyo on April 18.Kazuhiro Nogi/The Canadian Press The new U.S. ambassador to Japan arrived in Tokyo on Friday and said he is optimistic that his country and its key Asian ally will reach a deal in their ongoing tariff negotiations. George Glass, a prominent businessperson known for his background in finance, investment banking and technology, arrives as Washington and Tokyo are negotiating U.S. President Donald Trump’s tariff measures, which have triggered worldwide concern…