This check box displays whether a file is migrating, opting out, or
already migrated. The check box can be clicked to toggle between
migrating and opting out. Clicking the check box updates status in the
navigation tree. Clicking on check boxes updates the status in the
title bar.
Screenshot here: https://screenshot.googleplex.com/9z9v9L5DHhBXzEU.png
In terms of the HTML, a new parent above '.content' div was added:
the '.file' div, which includes a '.title-bar' div above the '.content'
div.
Bug: https://github.com/dart-lang/sdk/issues/44101 and
Change-Id: I021f0dd873119ae801e29faa92e97fe48d03ef3c
https://github.com/dart-lang/sdk/issues/44124
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/174440
Commit-Queue: Samuel Rawlins <srawlins@google.com>
Reviewed-by: Paul Berry <paulberry@google.com>