We should align this with profiler as well.
Don't you mean console.timelineStart (instead of console.timeline)? Also is console.timelines like console.profiles? Adding console.profiles was only meant for layout tests, and it was a mistake to expose. So following in those footsteps seems wrong.
Closing as invalid, as this bug pertains to the old inspector UI and/or its tests. Please file a new bug (https://www.webkit.org/new-inspector-bug) if the bug/feature/issue is still relevant to WebKit trunk.