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Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/45492 Changelog: [internal] When testing the changes in https://github.com/facebook/react-native/pull/45473 / D55491870, I saw that the reported time spans for long tasks didn't perfectly align with the long tasks themselves in traces (Perfetto). Taking a closer look, I realized that I wasn't doing the conversion between times and durations from `chrono` and `DOMHighResTimeStamp` (a `double`) correctly, and we're doing this conversion very often. This moves the definition of `DOMHighResTimeStamp` to its own library and adds conversion methods to make sure we don't make this mistake in the future. Reviewed By: rshest Differential Revision: D59820241 fbshipit-source-id: c123920de56336da384ddc484f6ac9d287724301