Description:Global chocolate makers ready their assault on Chinese taste buds. They're massing their forces at the World Chocolate Wonderland, a two-month exhibit in Shanghai. It's been a bitter sweet battle to wean locals off salty snacks. The result is a market that Euromonitor says is worth less than 2 billion dollars. That's about the same size as California's. But foreign firms are licking their lips at the potential.(2:08)