Expand ResolvedAst to handle synthetic constructors.

pkg/compiler/lib/src/serialization/serialization.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.
 
 library dart2js.serialization;
 
 import '../elements/elements.dart';
 import '../constants/expressions.dart';
 import '../dart_types.dart';
 import '../util/enumset.dart';
@@ skipping 664 matching lines @@
 
   /// Returns the id [Value] for [element].
   ///
   /// If [element] has no [DataObject], a new [DataObject] is created and
   /// encoding the [ObjectValue] for [element] is put into the work queue of
   /// this serializer.
   Value _getElementId(Element element) {
     if (element == null) {
       throw new ArgumentError('Serializer._getElementDataObject(null)');
     }
+    element = element.declaration;
     DataObject dataObject = _elementMap[element];
     if (dataObject == null) {
       if (!shouldInclude(element)) {
         if (element.isLibrary) {
           LibraryElement library = element;
           _elementMap[element] = dataObject = new DataObject(
               new IntValue(_elementMap.length),
               new EnumValue(SerializedElementKind.EXTERNAL_LIBRARY));
           ObjectEncoder encoder = new ObjectEncoder(this, dataObject.map);
           encoder.setUri(Key.URI, library.canonicalUri, library.canonicalUri);
@@ skipping 338 matching lines @@
 
   /// Returns the value used to store [key] as a property in the encoding an
   /// [ObjectValue].
   ///
   /// Different encodings have different restrictions and capabilities as how
   /// to store a [Key] value. For instance: A JSON encoding needs to convert
   /// [Key] to a [String] to store it in a JSON object; a Dart encoding can
   /// choose to store a [Key] as an [int] or as the [Key] itself.
   getObjectPropertyValue(Key key);
 }