The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0136a231d96aa63bc3921248dab99245b80ce856

commit 0136a231d96aa63bc3921248dab99245b80ce856
Author: kelvinp@chromium.org <kelvinp@chromium.org>
Date: Wed Aug 23 20:05:25 2017

Fix connection error to IT2ME host registered in the LCS channel.

Root cause:
The Chrome App doesn't know how to encode an LCS address properly
in an IQ message.

Fix:
Modifies SignalingAddress constructor to infer the channel type
from on the contents of the JID string.

Modifies SignalingAddress:SetInMessage() to use id() when setting
the |from| field in non-jingle messages. In the case of
register-support-host request, the |from| field is stored along
with the access code for support host lookup.

This change requires the SignalingAddress to obtain the default bot
JID from ServiceUrls.  ServiceUrls currently read the override URLs
from the command line, which is uninitialized when running under NaCl
and causes the plugin to crash.
Therefore, we need to modify service URLs to provide alternate way
of overriding the bot jid.

Bug: 756277
Change-Id: Icb8c093b27b097fb78acb7487f421124d5595db3
Reviewed-on: https://chromium-review.googlesource.com/617846
Commit-Queue: Kelvin Poon <kelvinp@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#496779}
[modify] https://crrev.com/0136a231d96aa63bc3921248dab99245b80ce856/remoting/base/BUILD.gn
[modify] https://crrev.com/0136a231d96aa63bc3921248dab99245b80ce856/remoting/base/service_urls.cc
[modify] https://crrev.com/0136a231d96aa63bc3921248dab99245b80ce856/remoting/base/service_urls.h
[modify] https://crrev.com/0136a231d96aa63bc3921248dab99245b80ce856/remoting/client/plugin/chromoting_instance.cc
[modify] https://crrev.com/0136a231d96aa63bc3921248dab99245b80ce856/remoting/host/register_support_host_request.cc
[modify] https://crrev.com/0136a231d96aa63bc3921248dab99245b80ce856/remoting/signaling/signaling_address.cc
[modify] https://crrev.com/0136a231d96aa63bc3921248dab99245b80ce856/remoting/signaling/signaling_address.h
[modify] https://crrev.com/0136a231d96aa63bc3921248dab99245b80ce856/remoting/signaling/signaling_address_unittest.cc