If true, the notification callback will be called using setImmediate() and multiple PerformanceEntry instance notifications
will be buffered internally. If false, notifications will be immediate and synchronous.
entryTypes
entryTypes:string[]
An array of strings identifying the types of PerformanceEntry instances the observer is interested in.
If true, the notification callback will be called using setImmediate() and multiple PerformanceEntry instance notifications will be buffered internally. If false, notifications will be immediate and synchronous.