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This allows us to filter UMA data by managed vs. unmanaged status on
the UMA dashboards for Chrome OS Lacros browser builds.

Information about Lacros is available at //docs/lacros.md or
internally at go/lacros

Bug: 1134341
Test: UMA.EnrollmentStatus appears in about:histograms
Change-Id: I2a7e7198b5ebb051231ecb070bc72fe32691ed2e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464028
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: Ian Barkley-Yeung <iby@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816682}