B737 First Officer reported the aircraft encountered moderate wake and/or jet blast turbulence on short final at LAX from a departing B747.

Narrative

While on ILS final to LAX Runway 25L at approximately 7 miles from Runway 25L and 2;000 feet AGL; LAX Tower cleared a B747 to take off in front of us on 25L. Both the Captain and I remarked that we were unhappy with the spacing and while it looked like the runway would be clear in time; we both remarked that we should be prepared to go-around. The Captain elected to fly slightly above the glide path to avoid turbulence; but at around 200 feet AGL we encountered moderate turbulence from the departing B747 lasting around 1-2 seconds. After exiting the turbulence I estimated we would touch down 2;000-2;500 feet down; and I said; 'We're going to be long.' The Captain made a smooth correction to glide path and a smooth touchdown probably around the 2;000 foot point. There were no GPWS warnings or 'long landing' warnings at any point. I don't know whether the Tower spacing between us and the B747 met standards; but I thought it was a poor decision to clear a B747 for takeoff in front of us with that spacing on the same runway.