Mouad Debbar 11cb3ce067 [web] Support platform view creation params (flutter/engine#42255)
1. Wire platform views' `creation params` in the engine.
2. Move acceptable factory signatures to `dart:ui_web`.
3. Don't put any JS types in `dart:ui_web`'s interface.
    -  Use type casting to check at runtime instead.
4. Tests.

Part of https://github.com/flutter/flutter/issues/127030
2023-06-02 21:53:47 +00:00
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