US lawmakers are asking Futurewei, a subsidiary of the blacklisted Chinese firm Huawei Technologies, to explain why it shared buildings in Silicon Valley with Nvidia, thrusting the US chipmaker into the crossfire of an investigation into possible Chinese espionage.A letter penned by Republican Chairman John Moolenaar and Democratic Ranking Member Raja Krishnamoorthi of the House Select Committee on China shows a decadelong history of a shared address for Futurewei Technologies at Nvidia’s...