This flag removes older non-SkSL shader caches that could interfere with SkSL
shader capturing. It also purges the SkSL shaders so use it only on the first
--cache-sksl run.

Play with the app to trigger as many animations
    as needed; particularly those with compilation jank.

Press M at the command line of flutter run to
    write the captured SkSL shaders into a file named something like
   flutter_01.sksl.json. For best results, capture SkSL shaders on an actual
   iOS device. A shader captured on a simulator isn’t likely to work correctly
   on actual hardware.

Build the app with SkSL warm-up using the following,
    as appropriate:

    
flutter build ios --bundle-sksl-path flutter_01.sksl.json