Add renames in output when using the mirror helper library.

sdk/lib/_internal/compiler/implementation/mirror_renamer/renamer.dart

Index: sdk/lib/_internal/compiler/implementation/mirror_renamer/renamer.dart
diff --git a/sdk/lib/_internal/compiler/implementation/mirror_renamer/renamer.dart b/sdk/lib/_internal/compiler/implementation/mirror_renamer/renamer.dart
index 003dda44768370e4daaa8994d6ab2ca587f32386..816c1883ac46fe5f9264c741df1608b77e2b3890 100644
--- a/sdk/lib/_internal/compiler/implementation/mirror_renamer/renamer.dart
+++ b/sdk/lib/_internal/compiler/implementation/mirror_renamer/renamer.dart
@@ -7,11 +7,15 @@ part of mirror_renamer;
 class MirrorRenamer {
   static const String MIRROR_HELPER_CLASS = 'MirrorHelper';
   static const String MIRROR_HELPER_GET_NAME_FUNCTION = 'getName';
+  static const String MIRROR_HELPER_ADD_RENAME_FUNCTION = 'addRename';
+
   static const String MIRROR_HELPER_LIBRARY_NAME = 'mirror_helper.dart';
   static const String MIRROR_HELPER_LIBRARY_PREFIX = 'm';
   static const String MIRROR_HELPER_CLASS_FULLY_QUALIFIED_NAME =
       '$MIRROR_HELPER_LIBRARY_PREFIX.$MIRROR_HELPER_CLASS';
 
+  static Map<String, String> inverseRenames;
+
   static void handleStaticSend(Map<Node, String> renames, Element element,
                                Send node, Compiler compiler) {
   if (element == compiler.mirrorSystemGetNameFunction) {
@@ -29,4 +33,17 @@ class MirrorRenamer {
         new Script(mirrorHelperUri, null));
     imports.putIfAbsent(mirrorHelperLib, () => MIRROR_HELPER_LIBRARY_PREFIX);
   }
+
+  static void registerRenames(Map<Node, String> renames) {
+    inverseRenames = new Map<String, String>();
+
+    for (Node node in renames.keys) {
+      if (node is Identifier) {
+        var stringValue = node.asIdentifier().source.stringValue;
+        if (stringValue != renames[node]) {
+          inverseRenames.putIfAbsent(renames[node], () => stringValue);
+        }
+      }
+    }
+  }
 }