add support for native methods in class

pkg/compiler/lib/src/parser/node_listener.dart

Index: pkg/compiler/lib/src/parser/node_listener.dart
diff --git a/pkg/compiler/lib/src/parser/node_listener.dart b/pkg/compiler/lib/src/parser/node_listener.dart
index f297808b7058b471752e078cc307485388a419ec..76ee1fac30ecae3aa52fe4f9a4f965a938a993cb 100644
--- a/pkg/compiler/lib/src/parser/node_listener.dart
+++ b/pkg/compiler/lib/src/parser/node_listener.dart
@@ -701,7 +701,8 @@ class NodeListener extends ElementListener {
   }
 
   @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();
@@ -710,6 +711,9 @@ class NodeListener extends ElementListener {
     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));
   }