GitLab

Adds associated analogs for Remote, Receiver, ReceiverSet,
PendingRemote, and PendingReceiver. Basic smoke test coverage for
compile and basic operation, since implementation is in terms of types
with extensive coverage already.

Bug: 875030
Change-Id: Ib441f15da94e1c481e9f7f88d3012ceda886bbf3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1574365
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652664}