Deferred parsing for legacy modules

pkg/dev_compiler/lib/src/compiler/code_generator.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' show HashMap, HashSet;
 import 'dart:math' show min, max;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 403 matching lines @@
         result.add(item);
       }
     }
   }
 
   String _libraryToModule(LibraryElement library) {
     assert(!_libraries.containsKey(library));
     var source = library.source;
     // TODO(jmesserly): we need to split out HTML.
     if (source.uri.scheme == 'dart') {
-      return 'dart_sdk';
+      return JS.dartSdkModule;
     }
     var moduleName = _buildUnit.libraryToModule(source);
     if (moduleName == null) {
       throw new StateError('Could not find module containing "$library".');
     }
     return moduleName;
   }
 
   void _finishImports(List<JS.ModuleItem> items) {
     var modules = new Map<String, List<LibraryElement>>();
@@ skipping 5455 matching lines @@
   if (targetIdentifier.staticElement is! PrefixElement) return false;
   var prefix = targetIdentifier.staticElement as PrefixElement;
 
   // The library the prefix is referring to must come from a deferred import.
   var containingLibrary = resolutionMap
       .elementDeclaredByCompilationUnit(target.root as CompilationUnit)
       .library;
   var imports = containingLibrary.getImportsWithPrefix(prefix);
   return imports.length == 1 && imports[0].isDeferred;
 }