add support for native methods in class

pkg/compiler/lib/src/parser/node_listener.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.parser.node_listener;
 
 import 'package:front_end/src/fasta/parser.dart'
     show FormalParameterKind, IdentifierContext, MemberKind;
 import 'package:front_end/src/fasta/scanner.dart' show Token;
 import 'package:front_end/src/scanner/token.dart' show TokenType;
@@ skipping 683 matching lines @@
 
   @override
   void endFields(int count, Token beginToken, Token endToken) {
     NodeList variables = makeNodeList(count, null, endToken, ",");
     TypeAnnotation type = popNode();
     Modifiers modifiers = popNode();
     pushNode(new VariableDefinitions(type, modifiers, variables));
   }
 
   @override
-  void endMethod(Token getOrSet, Token beginToken, Token endToken) {
+  void endMethod(
+      Token getOrSet, Token beginToken, Token nativeToken, Token endToken) {
     Statement body = popNode();
     AsyncModifier asyncModifier = popNode();
     NodeList initializers = popNode();
     NodeList formalParameters = popNode();
     NodeList typeVariables = popNode();
     Expression name = popNode();
     TypeAnnotation returnType = popNode();
     Modifiers modifiers = popNode();
+    if (nativeToken != null && body is EmptyStatement) {
+      body = new Block(new NodeList(nativeToken, const Link<Node>()));
+    }
     pushNode(new FunctionExpression(name, typeVariables, formalParameters, body,
         returnType, modifiers, initializers, getOrSet, asyncModifier));
   }
 
   @override
   void handleLiteralMap(
       int count, Token beginToken, Token constKeyword, Token endToken) {
     NodeList entries = makeNodeList(count, beginToken, endToken, ',');
     NodeList typeArguments = popNode();
     pushNode(new LiteralMap(typeArguments, entries, constKeyword));
@@ skipping 357 matching lines @@
     }
     lastErrorWasNativeFunctionBody = false;
   }
 
   void internalError({Token token, Node node}) {
     // TODO(ahe): This should call reporter.internalError.
     Spannable spannable = (token == null) ? node : token;
     failedAt(spannable, 'Internal error in parser.');
   }
 }