GitLab

Create a new agent that tracks authentication status for incognito
content in a given scene. Registers a pref for this setting.

Bug: 1138887
Change-Id: If5c094a645d41f744dd6f7f9d7dfda703f5b286d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522084
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Robbie Gibson <rkgibson@google.com>
Cr-Commit-Position: refs/heads/master@{#827241}