WIP add User Timings for the Interactivity API #60522
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adamsilverstein
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What?
Add performance marks to DevTools to assist with performance analysis, see https://developer.mozilla.org/en-US/docs/Web/API/Performance_API/User_timing.
Note: Debug code should be placed behind a build flag so that it can be excluded from production builds.
Why?
How?
Testing Instructions
Testing Instructions for Keyboard
Screenshots or screencast