Google (NASDAQ:GOOG) said its license to operate its Internet-search service in China was renewed by the country’s authorities. In January the tech giant had warned that it might cease operating in China and a couple of months later began redirecting users of its China site to its Hong Kong site. The company ended that redirection last week. In other news, UBS upgraded Costco Wholesale (NASDAQ:COST) to buy from neutral, saying that recent weakness in the share price, which has fallen 9% since April, is a good entry point for what it believes is "one of the world’s best retail business models." –MarketWatch Yahoo (NASDAQ:YHOO) is handing over its listings of homes for sale and local real estate advertising to Zillow.com, a real estate website. Zillow will oversee a…