MADISON, Wis. (AP) – Governor Scott Walker departs for his first overseas trade mission on Friday, a 10-day tour that takes him to three cities in China.   During his trip, Walker will join with governors from Virginia, Guam and Iowa for an event organized by the National Governors Association.   His itinerary includes briefings at the U.S. Embassy in Beijing and meetings with industry leaders. Walker is traveling to Shanghai, Harbin and Beijing.  Walker is leading a state delegation that includes leaders of the University of Wisconsin, the heads of major companies including Oshkosh Corporation, Harley-Davidson, Solaris and Badger State Ethanol.  China has long been a ripe market for products from the U.S. and Wisconsin. Walker’s predecessor, Democratic Governor Jim Doyle, led five trade missions there during his eight years as governor.