Warren Buffett’s Berkshire Hathaway Inc. agreed to inject $10 billion into Occidental Petroleum Corp.’s bid to acquire Anadarko Petroleum Corp. and fight off Chevron Corp. Last week, Houston-based Occidental offered to buy Anadarko for $38 billion, topping the $33 billion that Chevron agreed to pay for the company. The two sides are battling over prized energy assets in the heart of the U.S. oil boom in West Texas and New Mexico. …