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This is the basic polymer structure for the MultiDevice settings UI
main page. The "Set up" item is implemented concretely.

Change-Id: I4796f903b1f928bb77f5005e50574f11bb56a134
Reviewed-on: https://chromium-review.googlesource.com/1098153
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@{#567721}