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Reland (#167738) : [a11y] Semantics flag refactor step 2: embedder part *with some updates* The original PR was reverted because the changes to embedder should be in one PR to avoid introducing breaking changes. This PR contains 2 commits, one commit of re-landing #167738 and one commit of new enum updates. new Updates : Add new enum FlutterTristate and FlutterCheckState in embedder.h for 7 flags. For CheckState, it used to use 3 bools (hasCheck, isChecked, isCheckStateMixed) to represent check states, replace them with a FlutterCheckState enum. For other 6 flags, each has 2 bools (hasXXState and isXX), replace them with a FlutterTristate enum. TODO: Will also update these flags in dart:ui and framework to be tristate too in another PR, this PR is only for embedder. ## 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 --------- Co-authored-by: Chris Bracken <chris@bracken.jp> Co-authored-by: Loïc Sharma <737941+loic-sharma@users.noreply.github.com>
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