SACRAMENTO — Gov. Arnold Schwarzenegger is preparing to sign new gambling agreements with several Indian tribes, including one that could spawn California's first major urban casino — something the governor has said he opposed. The Bay Area facility, a short drive from Oakland and San Francisco, could be one of the world's largest gambling halls, as large as five Costcos, with up to 5,000 slot machines, multiple sources said Monday. The agreement would require that once the 259-member Lytton Band of Pomo Indians opened the facility, now the site of a card club called Casino San Pablo, it would pay...