Add ImportElement and ExportElement

pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart

 // Copyright (c) 2014, 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.js_emitter.full_emitter;
 
 import 'dart:convert';
 import 'dart:collection' show HashMap;
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
@@ skipping 1071 matching lines @@
     var uri = "";
     if (!compiler.enableMinification || backend.mustPreserveUris) {
       uri = library.canonicalUri;
       if (uri.scheme == 'file' && compiler.outputUri != null) {
         uri = relativize(compiler.outputUri, library.canonicalUri, false);
       }
     }
 
     String libraryName =
         (!compiler.enableMinification || backend.mustRetainLibraryNames) ?
-        library.getLibraryName() :
+        library.libraryName :
         "";
 
     jsAst.Fun metadata = task.metadataCollector.buildMetadataFunction(library);
 
     ClassBuilder descriptor = elementDescriptors[fragment][library];
 
     jsAst.ObjectInitializer initializer;
     if (descriptor == null) {
       // Nothing of the library was emitted.
       // TODO(floitsch): this should not happen. We currently have an example
@@ skipping 1019 matching lines @@
     for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) {
       if (element.isInstanceMember) {
         cachedClassBuilders.remove(element.enclosingClass);
 
         nativeEmitter.cachedBuilders.remove(element.enclosingClass);
 
       }
     }
   }
 }