Juanjo Tugores ec948a8b48 Move the accesibility placeholder to the platform dispatcher. (flutter/engine#50608)
Move the accesibility placeholder to the platform dispatcher.

This change makes the platform dispatcher append a single accesibility placeholder, per app, to the `<body />`. Previous behavior was to insert a placeholder inside each `<flutter-view />`

Relevant Issues are:

* Design doc: https://flutter.dev/go/focus-management 
* Focus in web multiview: https://github.com/flutter/flutter/issues/137443
* Platform dispatcher changes: https://github.com/flutter/engine/pull/49841

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
2024-02-15 22:07:58 +00:00
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