[Fasta] include source code in dill

pkg/kernel/lib/analyzer/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 kernel.analyzer.loader;
 
 import 'dart:async';
+import 'dart:convert';
 import 'dart:io' as io;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart';
 import 'package:analyzer/src/dart/sdk/sdk.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/parser.dart';
@@ skipping 803 matching lines @@
     loadEverything(target: target, compileSdk: compileSdk);
     if (mainMethod == null) {
       mainMethod = _makeMissingMainMethod(library);
     }
     program.mainMethod = mainMethod;
     for (LibraryElement libraryElement in libraryElements) {
       for (CompilationUnitElement compilationUnitElement
           in libraryElement.units) {
         var source = compilationUnitElement.source;
         LineInfo lineInfo = context.computeLineInfo(source);
-        String sourceCode;
+        List<int> sourceCode;
         try {
-          sourceCode = context.getContents(source).data;
+          sourceCode =
+              const Utf8Encoder().convert(context.getContents(source).data);
         } catch (e) {
           // The source's contents could not be accessed.
-          sourceCode = '';
+          sourceCode = const <int>[];
         }
         program.uriToSource['${source.uri}'] =
             new ast.Source(lineInfo.lineStarts, sourceCode);
       }
     }
   }
 
   ast.Library loadLibrary(Uri uri) {
     ast.Library library = getLibraryReferenceFromUri(uri);
     ensureLibraryIsLoaded(library);
@@ skipping 147 matching lines @@
   AnalysisContext context = AnalysisEngine.instance.createAnalysisContext()
     ..sourceFactory = new SourceFactory(resolvers)
     ..analysisOptions = createAnalysisOptions(options.strongMode);
 
   options.declaredVariables.forEach((String name, String value) {
     context.declaredVariables.define(name, value);
   });
 
   return context;
 }