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This brings across the changes made inside chromeos to the mojom that is
defined in chromium.

Bug: 884020
Change-Id: Iab4d789cf153fabbf8d243fd346e2188e9c4153b
Reviewed-on: https://chromium-review.googlesource.com/c/1321652Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Stuart Langley <slangley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605952}