support class native clause

pkg/analyzer/tool/summary/mini_ast.dart

Index: pkg/analyzer/tool/summary/mini_ast.dart
diff --git a/pkg/analyzer/tool/summary/mini_ast.dart b/pkg/analyzer/tool/summary/mini_ast.dart
index 5fe84ce286d17c873d861688aba1f47007371789..6a15270be95b68e2de7ee51bbf20cd2bbb88c9e2 100644
--- a/pkg/analyzer/tool/summary/mini_ast.dart
+++ b/pkg/analyzer/tool/summary/mini_ast.dart
@@ -187,12 +187,20 @@ class MiniAstBuilder extends StackListener {
     push(popList(memberCount));
   }
 
+  @override
+  void handleNativeClause(Token nativeToken, bool hasName) {
+    if (hasName) {
+      pop(); // Pop the native clause which in this case is a StringLiteral.
+    }
+  }
+
   void endClassDeclaration(
       int interfacesCount,
       Token beginToken,
       Token classKeyword,
       Token extendsKeyword,
       Token implementsKeyword,
+      Token nativeToken,
       Token endToken) {
     debugEvent("ClassDeclaration");
     List<ClassMember> members = pop();