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A privileged Javascript API is exposed to allowed origins, which
requires analogous plumbing between the renderer process and the browser
process.

In this patch, the Mojo interface is introduced and basic
implementation of both ends, with a browser test that exercises the full
flow.

Design doc (Googlers only):
https://docs.google.com/document/d/1YNrBAzmHlhjEigpjcR_hm7yrvGIuJOZpXEhtqNloUec/edit#bookmark=id.bgwil9c791bc

Bug: 984940
Change-Id: Ic3c941b5209a03bc35dce44ecdd31a8e47af0b84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1725913Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707792}