Use kernel transformation and VmTarget.

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

Index: pkg/front_end/lib/src/fasta/target_implementation.dart
diff --git a/pkg/front_end/lib/src/fasta/target_implementation.dart b/pkg/front_end/lib/src/fasta/target_implementation.dart
index e03738c93af27460ad680ecc9046054860f9dfc1..d34d9ec2b943a78c793f37cafa48be5aa0c1e02c 100644
--- a/pkg/front_end/lib/src/fasta/target_implementation.dart
+++ b/pkg/front_end/lib/src/fasta/target_implementation.dart
@@ -4,6 +4,9 @@
 
 library fasta.target_implementation;
 
+import 'package:kernel/target/vm.dart' show
+    VmTarget;
+
 import 'builder/builder.dart' show
     Builder,
     ClassBuilder,
@@ -64,4 +67,10 @@ abstract class TargetImplementation extends Target {
     LibraryBuilder internal = loader.read(Uri.parse("dart:_internal"));
     return cachedNativeAnnotation = internal.getConstructor("ExternalName");
   }
+
+  void loadExtraRequiredLibraries(Loader loader) {
+    for (String uri in new VmTarget(null).extraRequiredLibraries) {
+      loader.read(Uri.parse(uri));
+    }
+  }
 }