Make unit testing of the compiler work with the new isolate helper library.

tests/compiler/dart2js/dart_backend_test.dart

Index: tests/compiler/dart2js/dart_backend_test.dart
===================================================================
--- tests/compiler/dart2js/dart_backend_test.dart	(revision 16156)
+++ tests/compiler/dart2js/dart_backend_test.dart	(working copy)
@@ -61,6 +61,11 @@
 var JS;
 ''';
 
+const isolateHelperLib = r'''
+class _WorkerStub {
+}
+''';
+
 testDart2Dart(String src, {void continuation(String s), bool minify: false,
     bool stripTypes: false}) {
   // If continuation is not provided, check that source string remains the same.
@@ -94,6 +99,7 @@
     // TODO(smok): The file should change to html_dartium at some point.
     if (uri.path.endsWith('/html_dart2js.dart')) return new Future.immediate(htmlLib);
     if (uri.path.endsWith('/foreign_helper.dart')) return new Future.immediate(foreignLib);
+    if (uri.path.endsWith('/isolate_helper.dart')) return new Future.immediate(isolateHelperLib);

[ahe, 2012/12/14 10:13:52]

Long line.

     return new Future.immediate('');
   }