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In future, this will allow applications to query information about how
they were launched. Currently, the promise is hard coded to resolve to
{ cause: 'default', files: [] }.

The mojom security review requires that new services be as complete as
possible, hence the stubbing that is going on here
https://chromium.googlesource.com/chromium/src/+/master/docs/security/mojo.md#Do-not-define-unused-or-unimplemented-things
(a previous CL was rejected due to having an incomplete mojo service: https://chromium-review.googlesource.com/c/chromium/src/+/1597516).

This CL is a part of file-handling
https://github.com/WICG/file-handling/blob/master/EXPLAINER.md

Bug: 829689
Change-Id: I03d07d47b5b4c29d8367f465a34e439262e37dd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1621418Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Jay Harris <harrisjay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666604}