Uber Technologies Inc., the car-booking company, is seeking to raise as much as $1 billion in funding for its Chinese business, people familiar with the matter said. Uber China has been discussing a valuation of about $7 billion to $8 billion with potential backers, the people said, asking not to be identified because the discussions are confidential. Baidu Inc., the Beijing-based Internet firm that’s already an investor in Uber’s global operations, plans to buy a new stake in the local unit, according to two of the people.