There is a way to make a formal request of our developers. Go to our OpenMandriva Issue Tracker set up an account if you don’t have one and file a bug report selecting Lx 3.0 and then under importance select “trivial/enhancement”. Simply title it something like “Request for latest Chromium package” or similar.
FWIW: Chromium 59 is available in restricted updates repository. You’re likely to see 60 there first as well.
Usually one of our developers will build most recent chromium package eventually. Our developers are all part time folks with busy day jobs and lives. It tends to happen faster if someone makes a package upgrade request in OpenMandriva Issue Tracker.