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The main thrust of this CL is to build the multidevice-tethering-item
element which is a wrapper for the network-summary-item and provides
relevant updates. It is intended to encapsulate the tether-relevant
functionality of the network-summary element.

This also involved some mild refactoring in the settings/internet_page
folder to allow the network-summary-item to be reused in the
multidevice subpage and a fix of a minor bug in the cr-network-icon
element that was causing problems for the multidevice-tethering-item.

Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: Idb03c1f051cc03e825d0389508e1bd3e2e5d28e6
Reviewed-on: https://chromium-review.googlesource.com/1140733
Commit-Queue: Jordy Greenblatt <jordynass@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583148}