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The parent access widget should have a semi-transparent mask behind it
when it is created. This is automatically added when its modal type is
overridden to set modal type system, and taking effect on the signed in
and signed out session.

Bug: 921145
Change-Id: I3eaf9beede0c5ca7f15ca472e4f5b8aac2c7af54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1653255
Commit-Queue: Henrique Grandinetti <hgrandinetti@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#668605}