Nurhan Turgut 5d89045ca2 Adding support for enabling semantics on desktop (flutter/engine#14003)
* DRAFT: adding support for enabling semantics on desktop

* Working solution for desktop.

* Refactoring class structure. Removing unrelated comments.

* Fixing enabling semantics from dom_renderer

* Adding unit tests.Fixing failing cases. More refactoring.

* more work on tests.

* Fixing licences

* addressing PR comments
2019-11-26 18:59:26 -08:00
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