support class native clause

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

Index: pkg/front_end/lib/src/fasta/source/outline_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/source/outline_builder.dart b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
index 680c6022738c84db845bf54dcc38de1898d5c5f3..177891eb66e2785cad5441acd4067bbaf9ba88b5 100644
--- a/pkg/front_end/lib/src/fasta/source/outline_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
@@ -6,7 +6,7 @@ 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';
 
@@ -299,9 +299,15 @@ class OutlineBuilder extends UnhandledListener {
       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();