Speedometer should support signposting to help label generated profiles.
<rdar://problem/102061752>
Pull request: https://github.com/WebKit/WebKit/pull/6232
Pull request: https://github.com/WebKit/WebKit/pull/7230
Committed 257454@main (ce23b74e03ea): <https://commits.webkit.org/257454@main> Reviewed commits have been landed. Closing PR #7230 and removing active labels.