In this kind of auction, the winner pays the runner-up bid. Google simply increased that bid before it was communicated to the winner. The only effect, as this

In this kind of auction, the winner pays the runner-up bid. Google simply increased that bid before it was communicated to the winner. The only effect, as this doesn't change the bid order, is that Google pockets the "built-in handicap" on top of the runner-up bid, without telling the winner what the actual bid is.