Add new argument to compiler.

tests/compiler/dart2js/diagnose_ambiguous_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.
 
 import 'package:expect/expect.dart';
 import "package:async_helper/async_helper.dart";
 import 'memory_source_file_helper.dart';
 
 import '../../../sdk/lib/_internal/compiler/compiler.dart'
        show Diagnostic;
@@ skipping 11 matching lines @@
       return;
     }
     diagnostics.add('$uri:$begin:$end:$message:$kind');
   }
 
   Compiler compiler = new Compiler(provider.readStringFromUri,
                                    (name, extension) => null,
                                    diagnosticHandler,
                                    libraryRoot,
                                    packageRoot,
-                                   ['--analyze-only']);
+                                   ['--analyze-only'],
+                                   {});
   asyncTest(() => compiler.run(Uri.parse('memory:main.dart')).then((_) {
     diagnostics.sort();
     var expected = [
         "memory:exporter.dart:43:47:Info: 'hest' is defined here."
         ":info",
         "memory:library.dart:41:45:Info: 'hest' is defined here."
         ":info",
         "memory:main.dart:0:22:Info: 'hest' is imported here.:info",
         "memory:main.dart:23:46:Info: 'hest' is imported here.:info",
         "memory:main.dart:86:90:Error: Duplicate import of 'hest'.:error"
@@ skipping 25 matching lines @@
 hest() {}
 """,
   'exporter.dart': """
 library exporter;
 
 export 'library.dart';
 
 hest() {}
 """,
 };