DevTools assumes the framerate for a device does not change once the performance page opens
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bug
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screen: performance
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Some devices like a Pixel4 can intentionally switch between 60 and 90fps.
We currently appear to only query for the refresh rate on startup. We probably need to receive the target refresh rate with each frame timing even or receive separate events when the target frame rate changes.
https://github.com/flutter/devtools/blob/64aefd56202560727758bac7e5629841c902e5fa/packages/devtools_app/lib/src/performance/performance_controller.dart#L200
Fyi @kenzieschmoll, @jonahwilliams
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