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This initializes the `NativeAssetsApi` for native assets resolution in the isolate group creation callback. * https://github.com/dart-lang/sdk/issues/55523 ## Implementation considerations The DartIO initialization lives in its own GN target. This doesn't work for the native assets initialization due to it having to look up the `script_uri` in one of the callbacks. Since the callbacks are function pointers, we can't have a lambda that captures the script uri. So instead, the native assets initialization lives in the flutter/runtime target. The import from dart should probably be `runtime/include/bin/native_assets_api.h` to mirror what we're doing with dart IO, rather than directly importing from `runtime/bin/native_assets.h`. ## Testing All native asset testing is in flutter_tools, so those tests will only run once this rolls into flutter/flutter. I have done manual testing locally with a Dart branch that removes the fallback: https://dart-review.googlesource.com/c/sdk/+/370740 [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style