Use kernel transformation and VmTarget.

pkg/front_end/lib/src/fasta/loader.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library fasta.loader;
 
 import 'dart:async' show
     Future;
 
 import 'dart:collection' show
@@ skipping 54 matching lines @@
             break;
 
           default:
             fileUri = uri;
             break;
         }
       }
       LibraryBuilder library = target.createLibraryBuilder(uri, fileUri);
       if (uri.scheme == "dart" && uri.path == "core") {
         coreLibrary = library;
+        target.loadExtraRequiredLibraries(this);
       }
       first ??= library;
       if (library.loader == this) {
         unparsedLibraries.addLast(library);
       }
       return library;
     });
     return builder;
   }
 
@@ skipping 65 matching lines @@
   }
 
   Builder getCompileTimeError() => target.getCompileTimeError(this);
 
   Builder getNativeAnnotation() => target.getNativeAnnotation(this);
 }
 
 String format(double d, int fractionDigits, int width) {
   return d.toStringAsFixed(fractionDigits).padLeft(width);
 }