The Starfinder GM Core looks to have introduced this rule. Correct me if I'm wrong of course, but I don't think this rule has appeared in any Pathfinder book so far.
Essentially it grants a free skill increase at 1st, 3rd, 7th and 15th levels for a chosen skill as well as automatically gaining any general skill feats with the chosen skill as their specific prerequisite as soon as they qualify for them.
Just wanted to bring attention to it here because it seems like a fantastic addition to use in PF games as well.