R1:0856a36e97c5

When an object has been imported from an external source, show a curtain panel

Summary: Ref T10537. Show when an object is bridged to something external.

Test Plan: {F1190099}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10537

Differential Revision: https://secure.phabricator.com/D15520