Added support for exports and re-exports.

lib/compiler/implementation/apiimpl.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.
 
 #library('leg_apiimpl');
 
 #import('dart:uri');
 
 #import('../compiler.dart', prefix: 'api');
 #import('leg.dart', prefix: 'leg');
@@ skipping 55 matching lines @@
     return "lib/$path";
   }
 
   elements.LibraryElement scanBuiltinLibrary(String path) {
     Uri uri = libraryRoot.resolve(lookupLibraryPath(path));
     Uri canonicalUri = null;
     if (!path.startsWith("_")) {
       canonicalUri = new Uri.fromComponents(scheme: "dart", path: path);
     }
     elements.LibraryElement library =
-        scanner.loadLibrary(uri, null, canonicalUri);
+        libraryLoader.loadLibrary(uri, null, canonicalUri);
     return library;
   }
 
   void log(message) {
     handler(null, null, null, message, api.Diagnostic.VERBOSE_INFO);
   }
 
   leg.Script readScript(Uri uri, [tree.Node node]) {
     if (uri.scheme == 'dart') uri = translateDartUri(uri, node);
     var translated = translateUri(uri, node);
@@ skipping 65 matching lines @@
       handler(translateUri(span.uri, null), span.begin, span.end,
               message, kind);
     }
   }
 
   bool get isMockCompilation {
     return mockableLibraryUsed
       && (options.indexOf('--allow-mock-compilation') !== -1);
   }
 }