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This PR adds `RSuperellipse` support to Web, so that these ops will actually draw `RSuperellipse`s instead of falling back to `RRect`s, except for platform views. * (I was told in some earlier comments that RSuperellipses should fall back to RRects for platform views but I can't remember where for now. If reviewers think otherwise I can implement them right away or make this a TODO in the future.) The `RSuperellipse`s are drawn after being converted to paths. The algorithm is nothing new, but already used in `round_superellipse_param.cc`. For performance optimization, `RSuperellipse`s that have uniform radii will have their paths cached in a global cache after offset normalization. This PR does not add any new public APIs. (Although, I'm planning to also implement this to the main `dart:ui` in the future to support non-Impeller-nor-Web platforms, which will need `RSuperellipse.toPathOffset` public.) Fixes https://github.com/flutter/flutter/issues/163718 ## 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