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Parent CL has related mojo changes: crrev.com/c/2486525 .
Will need a separate CL to land for impl on Android side.
Explainer: https://github.com/WICG/digital-goods/blob/master/explainer.md#full-api-interface

Bug: 1140345
Change-Id: I06fa43dc79cf37b77edfe0c87817e697cbd1d4a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2497393Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Commit-Queue: Glen Robertson <glenrob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821036}