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This CL creates //components/services as the canonical location of
Mojo services within //components. It adds documentation and an OWNERS
file.

This CL also moves //components/font_service to
//components/services/font as the first step to getting all existing
services in //components into the canonical location.

The existing code there has a bunch of presubmit warnings. This CL does
not attempt to fix them.

This CL will be followed by changes to restore naming consistency:
- A change that moves the FontService Mojo interface to FontLoader,
  which is a more appropriate name
- A change that renames the font_service service to font and adjusts
  namespaces accordingly

NOPRESUBMIT=true
TBR=dcheng@chromium.org

Change-Id: I0cd668726d9841e6ef47a703c0042a7ec7d17833
Reviewed-on: https://chromium-review.googlesource.com/948855Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542141}