A time stamp label can be created by using console.timeStamp(label). A time stamp can be used together with HTTP traffic timing to measure when a certain piece of code was executed.

You can also add events to Chrome's timeline although it doesn't look quite like the photo in the documentation as it is wrapped in "Function Call (InjectedScript:1)", but they are visible as yellow markers in the timeline at the top of the lower "records" frame that will show the message in a tooltip if you hover over them.