Support Platform views

[HidenoriMatsubayashi]

We need to add support Platform views support to embed native views like WebView in a Flutter app

[jwinarske]

Hybrid Composition. Please read the Performance section.

The problem with the embedded space is that one size doesn't fit all. So having a generic Platform view solution may not meet the general communities needs. Please keep this in mind when looking at potential solutions.

[CodeDoctorDE]

What's the status of this issue?