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Ruslan Lesiutin
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Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/51511 # Changelog: [Internal] There are multiple changes: 1. `PerformanceTracer` class, `TraceEvent` struct are moved to `tracing` namespace. These are parts of the Tracing subsystems of the jsinspector, this should bring more clarity and make things more explicit. 2. Added `Timing.h` class which defines conversion logic from `HighResTimeStamp` to absolute units that are expected by CDP. 3. `PerformanceTracer` will receive timestamps for Performance Web API entries in `HighResTimeStamp`. Also, we will explicilty define a Tracking Clock time origin that will be epoch of the `steady_clock`. This aligns with the approach in Chromium and saves us from aligning custom DOMHighResTimeStamps that can be specified in performance.mark / performance.measure calls: these should not extend the timeline window. I've confirmed that this is the current behavior in Chromium. Reviewed By: rubennorte, huntie Differential Revision: D75185467 fbshipit-source-id: 37444392f12e8c9c4479c47c42b2c4badca7ecfd