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Screen

This CL makes the the update required screen use the checking-
downloading-update polymer element so that the UI for this process
remains in sync with the Update Screen which also uses the same element.
A new property for controlling the download message in the dialog is
added in the element as it is different for the UpdateRequiredScreen as
per the UI mocks.

Bug: 1048607
Change-Id: I9a9c26f10eff2b64602ffb59b1da1f61d4278b3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2078575
Commit-Queue: Saurabh Nijhara <snijhara@google.com>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748350}