MUMBAI, April 10 (Reuters Breakingviews) - International companies are reinforcing President Xi Jinping’s message that China is open for business. It’s a brief comfort for investors fretting about whether and how the country will fit into world trade given its soured relations with the United States. Japan Display’s (6740.T) shares soared 21% on Monday after the Apple (AAPL.O) supplier said it would provide its OLED technology to China’s HKC. The duo will construct plants for displays used in autos, wearables and other products. A day earlier, Tesla (TSLA.O) committed to building a factory in Shanghai that churns out 10,000 Megapack...