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WebRTC will improve its IP handling with mDNS and replace private IP
addresses with mDNS hostnames when signaling ICE host candidates to the
application. See the Internet Draft (draft-mdns-ice-candidates-02) for
the detailed approach.

This CL defines a Mojo interface of mDNS responder and implements it as
a service that will be consumed by WebRTC.

Bug: 878465
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I4b644286467622b3dfdb728a9d5f3a4bde9fc1ec
Reviewed-on: https://chromium-review.googlesource.com/c/1182875Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Eric Orth <ericorth@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Qingsi Wang <qingsi@google.com>
Cr-Commit-Position: refs/heads/master@{#604803}