U.S. video game companies havenât done well in China. Stymied by piracy and sometimes unable to understand the tastes of Chinese gamers, theyâre floundering in one of the fastest-growing game markets. But Seattle-based PopCap Games, which has pioneered the development of casual games such as âBejeweled,â hopes to buck the trend. The company is sending its long-time business development director James Gwertzman to Shanghai to head the companyâs Asia/Pacific office. Gwertzman has studied the Chi