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This widget is being create to facilitate the usage of the Parent
Access views in WebUI pages. With the widget it is possible to
instantiate the view without a pre-existing view hierarchy. We will
start using this in a follow up cl.

Bug: 921145, 921142
Change-Id: If57a14aac63a45c0da46766ce191ef392c322aae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610818Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Commit-Queue: Henrique Grandinetti <hgrandinetti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661063}