[Fasta] include source code in dill

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 a2adbcea8ab4d2a6b87016b85197b9579716e749..9ecedbc4dfa18ae4a75dfc6b138b78e72c063a13 100644
--- a/pkg/front_end/lib/src/fasta/target_implementation.dart
+++ b/pkg/front_end/lib/src/fasta/target_implementation.dart
@@ -65,5 +65,5 @@ abstract class TargetImplementation extends Target {
     }
   }
 
-  void addLineStarts(Uri uri, List<int> lineStarts);
+  void addSourceInformation(Uri uri, List<int> lineStarts, String sourceCode);
 }