TOKYO (AP) — Asian shares were mixed Wednesday ahead of a decision on interest rates by the U.S. Federal Reserve. U.S. futures edged higher while oil prices declined. Japan reported that it logged a trade surplus in February, with exports rising more than 11%. The Japanese central bank opted to keep its benchmark rate unchanged, as expected. The Fed also is expected to hold rates steady. Japan's benchmark Nikkei 225 edged up 0.2% to 37,900.88 after the central bank decided to keep the benchmark interest rate unchanged at 0.5%. The U.S. Federal Reserve is also expected to keep rates steady….