SHANGHAI, China (Reuters) - In a hushed auditorium in Shanghai's People's Square, hundreds of Chinese hold their breath as an actor mounts a revolving barricade, plants a billowing red flag and strikes up a song about revolution. A chorus of comrades -- many of them students -- join the call to arms, only to die in a volley of bullets from the army offstage. The parallels with China's recent past -- the 1949 communist revolution and the Tiananmen Square student-led pro-democracy movement -- are undeniable. But what really strikes a chord with the audience in the packed, multimillion-dollar theater in...