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This will be used for implementing permissions in WebLayer, and is the
equivalent of the chrome class of the same name.

Bug: 1025609
Change-Id: Iff7023262a1593c281ce350ecbd93536ee001db8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2098987Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749783}