BERLIN Germany 's Volkswagen said on Wednesday it would develop an in-house assisted driving chip for its business in China as it seeks to recover from sagging sales in the world's largest auto market. Volkswagen is still the leading foreign group operating in China but the auto giant's sales have drooped as local brands rise. It is also seeking to insulate itself from global tensions over semiconductors. The group announced a series of new electric and hybrid vehicles in April and an assisted