The PerformanceObserver is used to observe performance events and receive notifications when Lynx Engine generates performance entries.
It must be created through lynx.performance.createObserver() and bind with a callback function for handling received performance entries upon creation.
Specify a set of performance entry types to observe and start observing.
PerformanceObserver.disconnect()
Stop receiving performance entries.
The following example creates a PerformanceObserver watching for metric.fcp and pipeline entries.

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