R1:4b1815d6cca2

Add a "Startup" to DarkConsole

Summary: Ref T8588. It looks like something slow is happening //before// we start DarkConsole. Add some crude reporting to try to narrow it down.

Test Plan: {F743050}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T8588

Differential Revision: https://secure.phabricator.com/D13956