Add renames in output when using the mirror helper library.

sdk/lib/_internal/compiler/implementation/scanner/parser_task.dart

Index: sdk/lib/_internal/compiler/implementation/scanner/parser_task.dart
diff --git a/sdk/lib/_internal/compiler/implementation/scanner/parser_task.dart b/sdk/lib/_internal/compiler/implementation/scanner/parser_task.dart
index eca572b5d0f339b55b65f2e650793eb1f543dfdf..e83e6f542273865c79467334ec698f87cb1522dd 100644
--- a/sdk/lib/_internal/compiler/implementation/scanner/parser_task.dart
+++ b/sdk/lib/_internal/compiler/implementation/scanner/parser_task.dart
@@ -11,4 +11,15 @@ class ParserTask extends CompilerTask {
   Node parse(Element element) {
     return measure(() => element.parseNode(compiler));
   }
+
+  Node parseCompilationUnit(Token token) {
+    return measure(() {
+      NodeListener listener = new NodeListener(compiler, null);
+      Parser parser = new Parser(listener);
+      parser.parseUnit(token);
+      Node result = listener.popNode();
+      assert(listener.nodes.isEmpty);
+      return result;
+    });
+  }
 }