TOKYO (Reuters) -Toyota Motor agreed to give factory workers their biggest pay increase in 25 years on Wednesday, heightening expectations that bumper pay raises will give the central bank leeway to make a key policy shift next week. Toyota, Panasonic, Nissan and a number of other of Japan Inc's biggest names said they had agreed to fully meet union demands for pay increases at annual wage negotiations that wrap on Wednesday. The annual talks, long a defining feature of the usually collaborative relationship between Japanese management and labour, are being closely watched this year as the pay increases are expected to help clear the way for the central bank to end its years-long policy of negative interest rates as early as next week.