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This CL adds the extension policy for login screen extensions to the
visual output on chrome://policy. These extensions will be labeled with
"(login screen profile)" next to their name.
In the policy export, login screen extension policy will be located
under the "loginScreenExtensionPolicies" key, next to the
"extensionPolicies" key.

Bug: 1025760, b:145596153
Change-Id: I442753dbfe7c8d9df6c1b0993b69e19b14516dca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1924573
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Auto-Submit: Alexander Hendrich <hendrich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721493}