Internal libraries supported.

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

 // Copyright (c) 2012, 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.
 
 part of dart_backend;
 
 Function get _compareNodes =>
     compareBy((n) => n.getBeginToken().charOffset);
 
 typedef String _Renamer(Renamable renamable);
@@ skipping 124 matching lines @@
 
   Function makeElementRenamer(rename, generateUniqueName) => (element) {
     assert(Elements.isStaticOrTopLevel(element)
            || element is TypeVariableElement);
     // TODO(smok): We may want to reuse class static field and method names.
     String originalName = element.name.slowToString();
     LibraryElement library = element.getLibrary();
     if (identical(element.getLibrary(), compiler.coreLibrary)) {
       return originalName;
     }
-    if (library.isPlatformLibrary) {
+    if (library.isPlatformLibrary && !library.isInternalLibrary) {
       assert(element.isTopLevel());
       final prefix =
           imports.putIfAbsent(library, () => generateUniqueName('p'));
       return '$prefix.$originalName';
     }
 
     return rename(library, originalName);
   };
 
   Function makeRenamer(generateUniqueName) =>
@@ skipping 193 matching lines @@
     index ~/= firstCharAlphabet.length;
     int length = otherCharsAlphabet.length;
     while (index >= length) {
       resultBuilder.add(otherCharsAlphabet[index % length]);
       index ~/= length;
     }
     resultBuilder.add(otherCharsAlphabet[index]);
     return resultBuilder.toString();
   }
 }