Redpoint Ventures is doubling down on China. The firm, headquartered in Menlo Park, has filed documents with the U.S. Securities and Exchange Commission to raise $400 million across two new China-focused funds. The firm has set a $300 million target for its second flagship China fund, a significant increase from the $180 million it garnered for its debut China fund in 2016. Redpoint is also raising a $100 million opportunityfund that will also focus on the Chinese tech startup market.