Ensure PerformanceObserver callback fires for all observed entries between observe/disconnect calls.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PerformanceObserver callback fired: 1 entries
PASS mark1
PerformanceObserver callback fired: 2 entries
PASS mark2
PASS mark3
PerformanceObserver callback fired: 1 entries
PASS mark7
PASS successfullyParsed is true

TEST COMPLETE