GitLab

This moves native_viewport_service into core_services on desktop
mandoline builds, colocating the service with the surfaces service. We
can't do this on android yet because android does some tricks with the
ApplicationLoader to make the native_viewport_service run in the shell's
main thread.

BUG=484234

Review URL: https://codereview.chromium.org/1135703004

Cr-Commit-Position: refs/heads/master@{#330201}