Store and serialize NativeBehavior in TreeElements.

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 233 matching lines @@
 
 abstract class AnalyzableElementMixin implements AnalyzableElement, ElementZ {
   @override
   bool get hasTreeElements => _unsupported('hasTreeElements');
 
   @override
   TreeElements get treeElements => _unsupported('treeElements');
 }
 
 abstract class AstElementMixin implements AstElement, ElementZ {
+  // TODO(johnniwinther): This is needed for the token invariant assertion. Find
+  // another way to bypass the test for modelz.
   @override
-  bool get hasNode => _unsupported('hasNode');
+  bool get hasNode => false;
 
   @override
   bool get hasResolvedAst => _unsupported('hasResolvedAst');
 
   @override
   get node => _unsupported('node');
 
   @override
   ResolvedAst get resolvedAst => _unsupported('resolvedAst');
 }
@@ skipping 1721 matching lines @@
   }
 
   @override
   ElementKind get kind => ElementKind.PREFIX;
 
   @override
   Element lookupLocalMember(String memberName) {
     return _unsupported('lookupLocalMember');
   }
 }