support class native clause

pkg/front_end/lib/src/fasta/source/outline_builder.dart

 // Copyright (c) 2016, 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 fasta.outline_builder;
 
 import 'package:kernel/ast.dart' show ProcedureKind;
 
-import '../../scanner/token.dart' show Token;
+import '../../scanner/token.dart' show Token, TokenType;
 
 import '../builder/builder.dart';
 
 import '../combinator.dart' show Combinator;
 
 import '../fasta_codes.dart'
     show
         Message,
         codeExpectedBlockToSkip,
         messageOperatorWithOptionalFormals,
@@ skipping 272 matching lines @@
     library.currentDeclaration.name = name.lexeme;
   }
 
   @override
   void endClassDeclaration(
       int interfacesCount,
       Token beginToken,
       Token classKeyword,
       Token extendsKeyword,
       Token implementsKeyword,
+      Token nativeToken,
       Token endToken) {
     debugEvent("endClassDeclaration");
     String documentationComment = _getDocumentationComment(beginToken);
+    if (nativeToken?.next?.type == TokenType.STRING) {

[ahe, 2017/08/21 12:04:10]

Same comment as ast_builder.dart.

[danrubel, 2017/08/22 01:35:28]

Fixed as discussed previously.

+      // pop native clause - literal string

[ahe, 2017/08/21 12:04:10]

A sentence should start with an uppercase letter and end with a period. Same
below.

+      pop(); // char offset
+      pop(); // string
+    }
     List<TypeBuilder> interfaces = popList(interfacesCount);
     TypeBuilder supertype = pop();
     List<TypeVariableBuilder> typeVariables = pop();
     int charOffset = pop();
     String name = pop();
     if (typeVariables != null && supertype is MixinApplicationBuilder) {
       supertype.typeVariables = typeVariables;
       supertype.subclassName = name;
     }
     int modifiers = Modifier.validate(pop());
@@ skipping 649 matching lines @@
       docToken = docToken.next;
     }
     return buffer.toString();
   }
 
   @override
   void debugEvent(String name) {
     // printEvent(name);
   }
 }