Add visibility change perf metrics event #73
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Summary
Add
visibilitychangelistener. This allows the concept of a session to be introduced:https://developer.mozilla.org/en-US/docs/Web/API/Navigator/sendBeacon#sending_analytics_at_the_end_of_a_session
Test plan
Test end-to-end via internal D57576112
Upstreaming plan
devtools-frontendrepo. I've reviewed the contribution guide.