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This is a reland of f4c67a89

Original change's description:
> Elevation Service setup and COM registration.
> 
> Bug: 833687
> Change-Id: I1fef2e5ebac7ed44975996d67a43d1e26dc8ccb0
> Reviewed-on: https://chromium-review.googlesource.com/c/1244555
> Commit-Queue: S. Ganesh <ganesh@chromium.org>
> Reviewed-by: Greg Thompson <grt@chromium.org>
> Reviewed-by: Sorin Jianu <sorin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#598170}

Bug: 833687
Change-Id: I62ebfbc4a4992ddf0374a3be2432a7970ac4aaff
Reviewed-on: https://chromium-review.googlesource.com/c/1274835Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: S. Ganesh <ganesh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#598746}