THe IPs to whitelist are: https://chrome-swarming.appspot.com/botlist?c=id&c=os&c=task&c=status&c=external_ip&f=builder%3Amac-builder-perf&l=100&s=id%3Aasc
These seem to already be in the whitelist.
Comment 1 by simonhatch@chromium.org
, Sep 10