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Fixes https://github.com/flutter/flutter/issues/163576 Fixes https://github.com/flutter/flutter/issues/175184 This PR refactored the grafting part on `OverlayPortal`. Originally, the semantics tree of `OverlayPortal` was constructed/grafted in render object phase to make sure the correctness of the traversal order. However this resulted wrong hit-test order and the issue surfaced on web. With the fact that on web we are not able to graft/correct hit-test order tree, this PR: * Reverts the original grafting of the `OverlayPortal` so the hit-test order is always correct. * Then, we adds the grafting and updates the traversal order when we send `childrenInTraversalOrder` to engine. * Updating `childrenInTraversalOrder` causes it have different length from the length of `childrenInHitTestOrder` and wrong hit-test transform of the `OverlayPortal` children because when the transform is calculated, it assumes a correct traversal order. To fix these issues, this PR also: * recalculates the transform for `OverlayPortal` children. * adds `hitTestTransform` property and pass it to Android engine. * skip grafting for web because it assumes the same length of `childrenInTraversalOrder` and `childrenInHitTestOrder`. * added grafting by using `ARIA-owns` in web engine to fix the traversal order. ## 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.