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Always include the logged-in account in the list of contacts uploaded
to the Nearby Share server. Also, mark this contact as "selected".

This automatically enables sharing with other devices logged in with
the same account. This self-sharing works in all- or selected-contacts
visibility modes. Previously, to enable self-sharing, a user would need
to manually add their own account to their list of contacts at
contacts.google.com, for instance.

Verified fix with manual testing.

Fixed: 1138679
Change-Id: Ib3a2137257e4d4c56a43011d747811f522d9ad40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2487244
Auto-Submit: Josh Nohle <nohle@chromium.org>
Commit-Queue: James Vecore <vecore@google.com>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#818943}