Automatically capture long-duration raster frames as SKPs #92764
Description
It would be great to have a mode of running the engine where it would automatically spit out SKPs frames that take longer than budget (or some multiple of over budget) as SKPs.
This would be helpful when a developer has an application or benchmark with a particularly bad frame that they want to better understand and optimize, particularly when that frame is in the middle of an animation/transition.
It would also be helpful to emit metadata about the SKP, for example what frame number it was and how long it took to rasterize.
I think ideally this would either be a shell argument or a service protocol request to turn on/off, and that it could call ScreenshotLastLayerTree right after https://github.com/flutter/engine/blob/47446ca043c27d3406d859b56e980dd81e93a00b/shell/common/rasterizer.cc#L553 based on what the frame timings recorder said about how long it's been since the AcquireFrame call.