GitLab

Note this will need https://crrev.com/c/2484038 (ListPurchases mojo)
and a Clank-side implementation to land.

Explainer:
https://github.com/WICG/digital-goods/blob/master/explainer.md

Bug: 1139795
Change-Id: Ia70a8af535b14943322d1c2bd671bcf1d2726744
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2486007
Commit-Queue: Glen Robertson <glenrob@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Auto-Submit: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824707}