GitLab

Move the ChromeOS.* prefixed metrics into their own file/directory.
Most of these metrics are not general Chrome browser metrics, and this
will let us have a separate OWNERS file once we train up some
reviewers.

Bug: none
Change-Id: If42613c021c44e0e0639ec68db6f012416046c6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446519
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Auto-Submit: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814122}