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ui.Canvas and ui.SceneBuilder now use the DlPath object directly from the ui.Path object. This results in increased sharing of the wrapper objects which then increases the sharing of both the converted Impeller paths and Skia's volatile flag. The VolatilePathTracker mechanism is deleted and rather than count the number of frames that a path is stable for, instead we count the number of times it is used for rendering. If a path is used 100 times in a single frame, it will become non-volatile and start being cached almost immediately. The cached Impeller paths are now also tracked for all instances of the same path, rather than for each call site that originated from a DisplayList dispatch.