Add renames in output when using the mirror helper library.

sdk/lib/_internal/compiler/implementation/mirrors_used.dart

 // Copyright (c) 2013, 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.mirrors_used;
 
 import 'dart2jslib.dart' show
     Compiler,
     CompilerTask,
     Constant,
@@ skipping 102 matching lines @@
         symbols == null ? null : new Set<String>.from(symbols),
         targets == null ? null : new Set<Element>.from(targets),
         metaTargets == null ? null : new Set<Element>.from(metaTargets));
     librariesWithUsage = analyzer.librariesWithUsage;
   }
 
   /// Is there a @MirrorsUsed annotation in the library of [element]?  Used by
   /// the resolver to suppress hints about using new Symbol or
   /// MirrorSystem.getName.
   bool hasMirrorUsage(Element element) {
-    return librariesWithUsage != null
-        && librariesWithUsage.contains(element.getLibrary());
+    LibraryElement library = element.getLibrary();
+    // Internal libraries always have implicit mirror usage.
+    return library.isInternalLibrary
+        || (librariesWithUsage != null
+            && librariesWithUsage.contains(library));
   }
 
   /// Call-back from the resolver to analyze MirorsUsed annotations. The result
   /// is stored in [analyzer] and later used to compute
   /// [:analyzer.mergedMirrorUsage:].
   void validate(NewExpression node, TreeElements mapping) {
     for (Node argument in node.send.arguments) {
       NamedArgument named = argument.asNamedArgument();
       if (named == null) continue;
       Constant value = compiler.metadataHandler.compileNodeWithDefinitions(
@@ skipping 448 matching lines @@
       // @MirrorsUsed(targets: fisk)
       //                       ^^^^
       //
       // Instead of saying 'fisk' should pretty print the problematic constant
       // value.
       return spannable;
     }
     return node;
   }
 }