Add ImportElement and ExportElement

pkg/compiler/lib/src/js_backend/namer.dart

 // Copyright (c) 2011, 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 js_backend;
 
 /**
  * Assigns JavaScript identifiers to Dart variables, class-names and members.
  *
  * Names are generated through three stages:
@@ skipping 1126 matching lines @@
         ClassElement enclosingClass = element.enclosingClass;
         name = "${enclosingClass.name}_"
                "${element.name}";
       } else {
         name = element.name.replaceAll('+', '_');
       }
     } else if (element.isLibrary) {
       LibraryElement library = element;
       name = libraryLongNames[library];
       if (name != null) return name;
-      name = library.getLibraryOrScriptName();
+      name = library.libraryOrScriptName;
       if (name.contains('.')) {
         // For libraries that have a library tag, we use the last part
         // of the fully qualified name as their base name. For all other
         // libraries, we use the first part of their filename.
-        name = library.hasLibraryName()
+        name = library.hasLibraryName
             ? name.substring(name.lastIndexOf('.') + 1)
             : name.substring(0, name.indexOf('.'));
       }
       // The filename based name can contain all kinds of nasty characters. Make
       // sure it is an identifier.
       if (!IDENTIFIER.hasMatch(name)) {
         name = name.replaceAllMapped(NON_IDENTIFIER_CHAR,
             (match) => match[0].codeUnitAt(0).toRadixString(16));
         if (!IDENTIFIER.hasMatch(name)) {  // e.g. starts with digit.
           name = 'lib_$name';
@@ skipping 176 matching lines @@
   String globalObjectFor(Element element) {
     if (_isPropertyOfStaticStateHolder(element)) return staticStateHolder;
     LibraryElement library = element.library;
     if (library == backend.interceptorsLibrary) return 'J';
     if (library.isInternalLibrary) return 'H';
     if (library.isPlatformLibrary) {
       if ('${library.canonicalUri}' == 'dart:html') return 'W';
       return 'P';
     }
     return userGlobalObjects[
-        library.getLibraryOrScriptName().hashCode % userGlobalObjects.length];
+        library.libraryOrScriptName.hashCode % userGlobalObjects.length];
   }
 
   jsAst.Name deriveLazyInitializerName(jsAst.Name name) {
     // These are not real dart getters, so do not use GetterName;
     return new CompoundName([_literalLazyGetterPrefix, name]);
   }
 
   jsAst.Name lazyInitializerName(Element element) {
     assert(Elements.isStaticOrTopLevelField(element));
     jsAst.Name name = _disambiguateGlobal(element);
@@ skipping 621 matching lines @@
         first = true;
       }
     }
   }
 }
 
 enum NamingScope {
   global,
   instance,
   constant
-}
+}