If we do add this macro, I'd be inclined to add a big comment above it along the lines of "Thinking of using this macro?  Probably don't".  That is, counter histograms are mostly an anti-pattern, with a few exceptions.  For the most part, it's much better to implement metrics that have a built-in baseline.

I suppose that I'm not really opposed to landing this, perhaps named UMA_HISTOGRAM_HIT_COUNTER, to match the existing BooleanHit enum that we have defined in enums.xml (and typically use for such counter histograms).  I would still want to include a big caveat above the macro, since it's more often appropriate to include a baseline with any given metric.