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This PR adds `Path.addRSuperellipse` to `dart:ui`. This is needed to implement a parity class to `RoundedRectangleBorder` as discussed [here](https://github.com/flutter/flutter/pull/164857#issuecomment-2715637356). <details> <summary> Obsolete description, no longer applicable </summary> I want to reuse the existing algorithm created for impeller stroking. The existing algorithm is moved from `path_builder.cc` to `round_superellipse_param.cc`, and a delegated is added so that the same algorithm can output for different path classes. I'm not 100% sure this is _the_ best way to implement this, but I've tried some methods in vain. * `DlPathReceiver` added in https://github.com/flutter/flutter/pull/164753 sounds like a similar concept as the delegate created in this PR. I tried to use that but not only are the methods private, they're neither in an accessible directory. * I also thought of converting an impeller `Path` to a skia path, but it seems that the impeller path isn't designed to be traversed. * Another possibility is that we refactor impeller stroking to be based on the triangles instead of path, a direction we agreed to eventually move toward, which allows avoiding code share at all. I've briefly read the code in `StrokePathGeometry` and have some ideas but also something uncertain, so I didn't choose this path for now. </details> ## Pre-launch Checklist - [ ] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [ ] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [ ] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [ ] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [ ] I updated/added relevant documentation (doc comments with `///`). - [ ] I added new tests to check the change I am making, or this PR is [test-exempt]. - [ ] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [ ] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md
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