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This will allow TWAs to determine whether a browser supports launching
to site settings without having to hard code Chrome's package and
version.

Change-Id: I37b226be1a5118b38f10acb4edefce89db3ad973
Bug: 1119727
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366934
Commit-Queue: Peter Conn <peconn@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800123}