Add fingerprint for bug 1315062

1315062 is not a race condition, and the fix is here:
I15baf378b37841f8abb21294efebe2dee95077c3

So this is mainly for tracking purposes, to better get a sense of our
unclassified failure rate.

Change-Id: Ib9183ab62e7bdfc57da866f0b329b4b835208c65