BEIJING (Reuters) - The roots of Toyota Motor Corp's China troubles run far deeper than the anti-Japan protests that have swept the country, stretching back to the 2008 launch of the Yaris subcompact -- a spectacular flop with price-conscious Chinese buyers. The car, a success elsewhere, was meant to help build brand loyalty and send Toyota hurtling towards a still-unattained goal of selling one million vehicles annually in the world's largest auto market. However the Yaris missed the mark with China's traditional higher-end customers as well as its new emerging middle class. ...