Currently Impeller asks incoming paths to convert themselves into the
impeller::Path class before tessellating their outlines. This wastes
conversion time when the path is only needed to iterate the path
segments. We now tessellate them directly from a path segment dispatcher
saving the conversion cost.
Flow is a simple compositor based on Skia that the Flutter engine uses to cache
recorded paint commands and pixels generated from those recordings. Flow runs on
the raster thread and uploads information to Skia.