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This PR is to add ARIA landmark roles to `SemanticsRole`: complementary, contentInfo, main, navigation and region. I skipped `sectionhead` because it is an abstract role based on the [MDN docs](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Reference/Roles/sectionhead_role#:~:text=The%20structural%20sectionhead%20role%20is%20an%20abstract%20role%20for%20the%20subclass%20roles%20that%20identify%20the%20labels%20or%20summaries%20of%20the%20sections%20they%20label.%20The%20role%20must%20not%20be%20used.) . Fixes https://github.com/flutter/flutter/issues/162138 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [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] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing.
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