Deferred parsing for legacy modules

pkg/dev_compiler/lib/src/compiler/js_names.dart

 // Copyright (c) 2015, 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.
 
 import 'dart:collection';
 
 import '../js_ast/js_ast.dart';
 
+/// The ES6 name for the Dart SDK.  All dart:* libraries are in this module.
+const String dartSdkModule = 'dart_sdk';
+
 /// Unique instance for temporary variables. Will be renamed consistently
 /// across the entire file. Different instances will be named differently
 /// even if they have the same name, this makes it safe to use in code
 /// generation without needing global knowledge. See [TemporaryNamer].
 // TODO(jmesserly): move into js_ast? add a boolean to Identifier?
 class TemporaryId extends Identifier {
   TemporaryId(String name) : super(name);
 }
 
 /// Creates a qualified identifier, without determining for sure if it needs to
@@ skipping 268 matching lines @@
 bool invalidStaticFieldName(String name) {
   switch (name) {
     case "arguments":
     case "caller":
     case "callee":
     case "name":
       return true;
   }
   return false;
 }