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Specify in the histogram README and presubmit checks that the primary
owner of a histogram needs to be a Googler, not just someone with an
@chromium.org email address.

Bug: 1142896
Change-Id: I39e522430d6cacb44c39645efb31499394e8d218
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2504631
Commit-Queue: Mario Bianucci <mabian@microsoft.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821780}