Support jsinterop/world_test from .dill

tests/compiler/dart2js/kernel/impact_test.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 dart2js.kernel.impact_test;
 
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/common.dart';
 import 'package:compiler/src/common_elements.dart';
 import 'package:compiler/src/common/names.dart';
@@ skipping 12 matching lines @@
 import 'package:compiler/src/universe/feature.dart';
 import 'package:compiler/src/universe/use.dart';
 import 'package:compiler/src/util/util.dart';
 import '../equivalence/check_helpers.dart';
 import 'compiler_helper.dart';
 import 'test_helpers.dart';
 
 const Map<String, String> SOURCE = const <String, String>{
   // Pretend this is a dart2js_native test to allow use of 'native' keyword.
   'sdk/tests/compiler/dart2js_native/main.dart': r'''
-@JS()
-library test;
-
 import 'dart:_foreign_helper' as foreign show JS;
 import 'dart:_foreign_helper' hide JS;
 import 'dart:_js_helper';
 import 'dart:_interceptors';
 import 'dart:_native_typed_data';
 import 'dart:indexed_db';
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:math';
 import 'dart:typed_data';
 import 'dart:web_sql';
-import 'package:js/js.dart';
 import 'helper.dart';
+import 'jsinterop.dart';
 
 main() {
   testEmpty();
   testNull();
   testTrue();
   testFalse();
   testInt();
   testDouble();
   testString();
   testStringInterpolation();
@@ skipping 632 matching lines @@
   @annotation_Creates_SerializedScriptValue
   final Object field;
 
   factory NativeClass._() { throw new UnsupportedError("Not supported"); }
 }
 testNativeField(NativeClass c) => c.field;
 testMixinInstantiation() => new Sub();
 testNamedMixinInstantiation() => new NamedMixin();
 testGenericMixinInstantiation() => new GenericSub<int, String>();
 testGenericNamedMixinInstantiation() => new GenericNamedMixin<int, String>();
+''',
+  'sdk/tests/compiler/dart2js_native/jsinterop.dart': '''
+@JS()
+library jsinterop;
+
+import 'package:js/js.dart';
 
 @JS()
 external int testJsInteropMethod();
 
 @JS()
 class JsInteropClass {
+  external JsInteropClass();
+
   @JS()
   external double method();
 }
 
 testJsInteropClass() => new JsInteropClass().method();
 ''',
   'sdk/tests/compiler/dart2js_native/helper.dart': '''
 import 'dart:_js_helper';
 class Class {
   const Class.generative();
@@ skipping 193 matching lines @@
         builder.registerFeature(Feature.THROW_EXPRESSION);
         break;
       default:
         builder.registerFeature(feature);
         break;
     }
   }
   impact.nativeData.forEach(builder.registerNativeData);
   return builder;
 }