Add renames in output when using the mirror helper library.

sdk/lib/_internal/compiler/implementation/dart_backend/emitter.dart

Index: sdk/lib/_internal/compiler/implementation/dart_backend/emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/dart_backend/emitter.dart b/sdk/lib/_internal/compiler/implementation/dart_backend/emitter.dart
index c58319ee6082fa9c8cb22d83bc9a72e3532371ff..c9e2940321bb17db1a4a08b8c6b4e5a648839cb6 100644
--- a/sdk/lib/_internal/compiler/implementation/dart_backend/emitter.dart
+++ b/sdk/lib/_internal/compiler/implementation/dart_backend/emitter.dart
@@ -13,8 +13,16 @@ String emitCode(
     unparser.unparseImportTag('${libraryElement.canonicalUri}', prefix);
   });
 
+

[ahe, 2013/08/12 15:43:21]

Extra line.

+  bool isTopLevelMain(Node node) =>

[ahe, 2013/08/12 15:43:21]

In dart2js, we tend to perfer '{ return expr; }' when '=> expr;' doesn't fit on
one line.

[ahe, 2013/08/12 15:43:21]

I'm not at all sure about this method. What is it for?

+    (node is FunctionExpression &&

[ahe, 2013/08/12 15:43:21]

FunctionExpression functionExpression = node.asFunctionExpression();
if (functionExpression != null) {
...
}

+     (node as FunctionExpression).name.asIdentifier().source.

[ahe, 2013/08/12 15:43:21]

....source == const SourceString('main')

+         stringValue == 'main');
+
   for (final node in topLevelNodes) {
-    if (node is ClassNode) {
+    if ((unparser is MirrorRenamerUnparser) && isTopLevelMain(node)) {
+      (unparser as MirrorRenamerUnparser).unparseTopLevelMain(node);

[ahe, 2013/08/12 15:43:21]

Don't use casts, they are slow and unnecessary. Instead introduce a new
variable:

MirrorRenamerUnparser mirrorUnparser = unparser;

+    } else if (node is ClassNode) {
       // TODO(smok): Filter out default constructors here.
       unparser.unparseClassWithBody(node, classMembers[node]);
     } else {