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## Reland https://github.com/flutter/engine/pull/48849 was reverted as it incorrectly expected to receive always 1 layer. However, the engine will present 0 layers on an ["empty" app](6981fe6fd3/dev/integration_tests/ui/lib/empty.dart (L8-L19)). This pull request is split into two commits: 1.df604a16c0is the original pull request, unchanged 2.c30b369289adds the ability to "clear" the view if the engine presents 0 layers ## Original pull request description This migrates the Windows embedder to `FlutterCompositor` so that the engine renders off-screen to a framebuffer instead of directly onto the window's surface. This will allow us to support platform views and multiple views on Windows. Addresses https://github.com/flutter/flutter/issues/128904 [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style