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This plumbs the origin policy IDs from the net-side OriginPolicyContents
through to the renderer, where they get exposed on Window. This does not
yet tackle WorkerGlobalScope, but it does add idlharness tests for it,
which fail for now.

This is a re-land of
https://chromium-review.googlesource.com/c/chromium/src/+/2089994 which
was reverted in
https://chromium-review.googlesource.com/c/chromium/src/+/2093453. The
re-land adds MSAN test expectations per https://crbug.com/856601.

Bug: 1057123
Change-Id: I30053986f3dfc634399c8e0f3fc1578e062c67f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095706
Auto-Submit: Domenic Denicola <domenic@chromium.org>
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748551}