[Fasta] include source code in dill

pkg/front_end/lib/src/fasta/source/source_loader.dart

Index: pkg/front_end/lib/src/fasta/source/source_loader.dart
diff --git a/pkg/front_end/lib/src/fasta/source/source_loader.dart b/pkg/front_end/lib/src/fasta/source/source_loader.dart
index 5e508462945b3ac4b52d8aadfc046d5f5989957a..a43a32826f3bd9ca4e769c2ac5fd618a7cceef17 100644
--- a/pkg/front_end/lib/src/fasta/source/source_loader.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_loader.dart
@@ -40,8 +40,11 @@ import 'diet_parser.dart' show DietParser;
 
 import 'source_library_builder.dart' show SourceLibraryBuilder;
 
+import '../compiler_context.dart' show CompilerContext;
+
 class SourceLoader<L> extends Loader<L> {
   final Map<Uri, List<int>> sourceBytes = <Uri, List<int>>{};
+  bool get includeSource => CompilerContext.current.options.includeSource;
 
   // Used when building directly to kernel.
   ClassHierarchy hierarchy;
@@ -64,7 +67,8 @@ class SourceLoader<L> extends Loader<L> {
       ScannerResult result = scan(bytes);
       Token token = result.tokens;
       if (!suppressLexicalErrors) {
-        target.addLineStarts(library.fileUri, result.lineStarts);
+        var source = includeSource ? new String.fromCharCodes(bytes) : "";

[ahe, 2017/03/03 12:30:32]

This should be UTF8.encode(bytes), but I really think it should be List<int>.

+        target.addSourceInformation(library.fileUri, result.lineStarts, source);
       }
       while (token is ErrorToken) {
         if (!suppressLexicalErrors) {