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REGRESSION(290430@main): Timelines recording stops on page reload even when auto-stop is disabled
https://bugs.webkit.org/show_bug.cgi?id=310137
rdar://169732727

Reviewed by NOBODY (OOPS!).

290430@main split `InspectorTimelineAgent` into `PageTimelineAgent` and
`WorkerTimelineAgent`. When `mainFrameStartedLoading()` was moved to
`PageTimelineAgent`, the `if (m_tracking) return;` guard was dropped.

This guard prevents the backend from dispatching `Timeline.autoCaptureStarted`
to the frontend when a recording is already active. Without it, every page reload
or navigation during an active recording causes `WI.TimelineManager.prototype.autoCaptureStarted()`
on the frontend to unconditionally stop the current recording and start a new one,
regardless of the "Stop recording once page loads" setting.

This patch restores the guard so that `PageTimelineAgent::mainFrameStartedLoading()`
is a no-op when instruments are already recording.

* Source/WebCore/inspector/agents/page/PageTimelineAgent.cpp:
(WebCore::PageTimelineAgent::mainFrameStartedLoading):

18ceef0

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