The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6268c97f272cc90dd749313ba2c82ce7000996ac

commit 6268c97f272cc90dd749313ba2c82ce7000996ac
Author: Tim Brown <timbrown@chromium.org>
Date: Mon Jun 18 21:52:35 2018

Update linux distro histogram for Leap 15.*

It turns out that openSuse decided to call the version "15.0", not "15",
so we aren't currently detecting it. Also, there are two guaranteed
point releases, so support for detecting those has been added already.

I've also added thomasanderson@ as a co-owner of the histogram.

Bug:  853354 
Change-Id: I6867e13833744f4fa0013b1f505c318cc3893051
Reviewed-on: https://chromium-review.googlesource.com/1103279
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Tim Brown <timbrown@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568179}
[modify] https://crrev.com/6268c97f272cc90dd749313ba2c82ce7000996ac/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
[modify] https://crrev.com/6268c97f272cc90dd749313ba2c82ce7000996ac/tools/metrics/histograms/enums.xml
[modify] https://crrev.com/6268c97f272cc90dd749313ba2c82ce7000996ac/tools/metrics/histograms/histograms.xml