Jens Stutte
b14c9be113
The existing "AsyncShutdown blocker" marker spans from the moment a blocker is registered, which for most blockers is startup, so a profile shows a wall of multi second intervals that say nothing about shutdown itself. Stamp the time at which the barrier starts waiting for a blocker and emit a second marker covering only that wait, so it is visible which blockers actually delayed which phase. Differential Revision: https://phabricator.services.mozilla.com/D320447