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This adds a //net-based implementation of the Open Screen UdpSocket
interface. Its main use is for unit tests that do not have or require
the network service.

Bug: 1110490
Change-Id: Ic542c3c29d05b5c58d36efb6fd31d0eeac3cefe5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580908Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: Jordan Bayles <jophba@chromium.org>
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836822}