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This ensures FlutterMetalTexture.destruction_callback gets called.
FlutterRendererConfig.get_next_drawable_callback holds a callback used by the embedder API to request a drawable; in the case of Metal, this drawable is a FlutterMetalTexture.
FlutterMetalTexture.destruction_callback should be called when it's safe to release resources associated with the FlutterMetalTexture. This callback is not currently invoked for textures returned via FlutterRendererConfig.get_next_drawable_callback; instead we unpack the returned struct and pass it on.
In the compositor codepath, we do create an SkSurface that triggers the destruction callback, here:
bbdb5d6a3e/shell/platform/embedder/embedder.cc (L868-L881)
Issue: https://github.com/flutter/flutter/issues/116381