GitLab

Adds stub pages for high visibility and confirm to the receive dialog.
Future CLs will flesh these out and wire up a mojo to communicate with
the share service.

Screenshots:
http://screen/6QvnCB5NppKzGpC.png
http://screen/32LmeXBLxmDvayD.png

Bug: b:163148440, b:163147818
Change-Id: I68e248d54000ddd580ae8dc6a9ddc076b1ceddb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2384790
Commit-Queue: James Vecore <vecore@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803392}