The California Assembly on Monday sent Gov. Jerry Brown a hard-fought and historic expansion of overtime rules for farmworkers, but it remains uncertain whether the Democratic governor will sign off on the measure. A nearly identical bill fell three votes short of passage on the Assembly floor in May, with 15 Democrats voting against the measure or declining to vote. But on Monday, an amended version of the measure, now contained in Assembly Bill 1066, passed on a 44-32 vote. Agricultural workers already receive some overtime pay under California law thanks to a 2002 state directive that entitles them to extra wages if they work more than 10 hours in a day or more than 60 hours in a week. AB 1066 would expand that to bring it more in line with other industries, offering time-and-a-half pay for working more than eight hours in a day or 40 in a week and double pay for working more than 12 hours a day. The pay boosts would kick in incrementally over four years, and the governor could suspend them for a year if the economy falters.