Add MultiSourceInformationStrategy

tests/compiler/dart2js/exit_code_test.dart

 // Copyright (c) 2013, 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.
 
 // Test the exit code of dart2js in case of exceptions, errors, warnings, etc.
 
 import 'dart:async';
 import 'dart:io' show Platform;
 
 import 'package:async_helper/async_helper.dart';
@@ skipping 110 matching lines @@
   }
 }
 
 class TestBackend extends JavaScriptBackend {
   final TestCompiler compiler;
   TestBackend(TestCompiler compiler)
       : this.compiler = compiler,
         super(compiler,
             generateSourceMap: compiler.options.generateSourceMap,
             useStartupEmitter: compiler.options.useStartupEmitter,
+            useMultiSourceInfo: compiler.options.useMultiSourceInfo,
             useNewSourceInfo: compiler.options.useNewSourceInfo,
             useKernel: compiler.options.useKernel);
 
   @override
   WorldImpact codegen(CodegenWorkItem work) {
     compiler.test('Compiler.codegen');
     return super.codegen(work);
   }
 }
 
@@ skipping 170 matching lines @@
 
       expected =
           _expectedExitCode(beforeRun: tests[marker], fatalWarnings: true);
       totalExpectedErrors += expected.length;
       await testExitCodes(marker, expected, ['--fatal-warnings']);
     }
 
     Expect.equals(totalExpectedErrors, checkedResults);
   });
 }