support class native clause

pkg/front_end/lib/src/fasta/parser/listener.dart

Index: pkg/front_end/lib/src/fasta/parser/listener.dart
diff --git a/pkg/front_end/lib/src/fasta/parser/listener.dart b/pkg/front_end/lib/src/fasta/parser/listener.dart
index cf593707ba667256f50549309facba3f41fc13df..ed125679f62da83f9674fea6f676755c2725356f 100644
--- a/pkg/front_end/lib/src/fasta/parser/listener.dart
+++ b/pkg/front_end/lib/src/fasta/parser/listener.dart
@@ -95,6 +95,7 @@ class Listener {
   /// - type variables
   /// - supertype (may be a mixin application)
   /// - implemented types
+  /// - native clause
   /// - class body
   void endClassDeclaration(
       int interfacesCount,
@@ -102,6 +103,7 @@ class Listener {
       Token classKeyword,
       Token extendsKeyword,
       Token implementsKeyword,
+      Token nativeToken,
       Token endToken) {
     logEvent("ClassDeclaration");
   }
@@ -962,6 +964,10 @@ class Listener {
     logEvent("Modifiers");
   }
 
+  void handleNativeClause(Token nativeToken, bool hasName) {
+    logEvent("NativeClause");
+  }
+
   void handleNamedArgument(Token colon) {
     logEvent("NamedArgument");
   }