Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/45473
This is a basic implementation of the Long Tasks API (https://w3c.github.io/longtasks/).
It detects and reports long tasks when using the Event Loop (in the modern RuntimeScheduler) when a new feature flag for this purpose is enabled.
This doesn't include attribution information at the moment.
Changelog: [internal]
Reviewed By: sammy-SC
Differential Revision: D55491870
fbshipit-source-id: e1ccad9cc6a35073b31230a8cf3a4660ab9a043d