Add names and support for preserialized data to serialization tests

pkg/compiler/lib/src/serialization/modelz.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.
 
 /// Implementation of the element model used for deserialiation.
 ///
 /// These classes are created by [ElementDeserializer] triggered by the
 /// [Deserializer].
 
 library dart2js.serialization.modelz;
@@ skipping 477 matching lines @@
     if (_imports == null) {
       _imports = _decoder.getElements(Key.IMPORTS, isOptional: true);
     }
     return _imports;
   }
 }
 
 class ScriptZ implements Script {
   final Uri resourceUri;
   SourceFile _file;
+  bool _isSynthesized = false;
 
   ScriptZ(this.resourceUri);
 
   @override
   Script copyWithFile(SourceFile file) {
     throw new UnsupportedError('ScriptZ.copyWithFile');
   }
 
   @override
   SourceFile get file {
     if (_file == null) {
       throw new UnsupportedError('ScriptZ.file');
     }
     return _file;
   }
 
   void set file(SourceFile value) {
     _file = value;
   }
 
   // TODO(johnniwinther): Decide if it is meaningful to serialize erroneous
   // elements.
   @override
-  bool get isSynthesized => false;
+  bool get isSynthesized => _isSynthesized;
+
+  void set isSynthesized(bool value) {
+    _isSynthesized = value;
+  }
 
   @override
   String get name {
     if (_file != null) {
       return _file.filename;
     }
     return resourceUri.toString();
   }
 
   // TODO(johnniwinther): Support the distinction between [readableUri] and
@@ skipping 1623 matching lines @@
   }
 
   @override
   ElementKind get kind => ElementKind.PREFIX;
 
   @override
   Element lookupLocalMember(String memberName) {
     return _unsupported('lookupLocalMember');
   }
 }