Add structured types and convert implementations to use typesafe method calls for platform methods from Dart to native side. Android analog of #6601 Part of flutter/flutter#117905 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] page, which explains my responsibilities. - [x] I read and followed the [relevant style guides] and ran the auto-formatter. (Unlike the flutter/flutter repo, the flutter/packages repo does use `dart format`.) - [ ] I signed the [CLA]. - [x] The title of the PR starts with the name of the package surrounded by square brackets, e.g. `[shared_preferences]` - [x] I [linked to at least one issue that this PR fixes] in the description above. - [x] I updated `pubspec.yaml` with an appropriate new version according to the [pub versioning philosophy], or this PR is [exempt from version changes]. - [x] I updated `CHANGELOG.md` to add a description of the change, [following repository CHANGELOG style], or this PR is [exempt from CHANGELOG changes]. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord].  [Contributor Guide]: https://github.com/flutter/packages/blob/main/CONTRIBUTING.md [Tree Hygiene]: https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md [relevant style guides]: https://github.com/flutter/packages/blob/main/CONTRIBUTING.md#style [CLA]: https://cla.developers.google.com/ [Discord]: https://github.com/flutter/flutter/blob/master/docs/contributing/Chat.md [linked to at least one issue that this PR fixes]: https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md#overview [pub versioning philosophy]: https://dart.dev/tools/pub/versioning [exempt from version changes]: https://github.com/flutter/flutter/blob/master/docs/ecosystem/contributing/README.md#version [following repository CHANGELOG style]: https://github.com/flutter/flutter/blob/master/docs/ecosystem/contributing/README.md#changelog-style [exempt from CHANGELOG changes]: https://github.com/flutter/flutter/blob/master/docs/ecosystem/contributing/README.md#changelog [test-exempt]: https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md#tests
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 +## 0.10.9+15
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 +* Converts Dart to native platform calls to Pigeon.
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 ## 0.10.9+14
 * Converts native to Dart platform calls to Pigeon.