add support for native methods in class

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 a0a234256e5c5c164b93008addd72e77f696c285..0003142dc01d14f5c3c02c562de3c971a63503dc 100644
--- a/pkg/front_end/lib/src/fasta/source/outline_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
@@ -16,6 +16,7 @@ import '../fasta_codes.dart'
     show
         Message,
         codeExpectedBlockToSkip,
+        messageNativeClauseShouldBeAnnotation,
         messageOperatorWithOptionalFormals,
         messageTypedefNotFunction,
         templateDuplicatedParameterName,
@@ -297,7 +298,9 @@ class OutlineBuilder extends UnhandledListener {
     if (hasName) {
       // Pop the native clause which in this case is a StringLiteral.
       pop(); // Char offset.
-      pop(); // String.
+      nativeMethodName = pop(); // String.
+    } else {
+      nativeMethodName = '';
     }
   }
 
@@ -391,7 +394,8 @@ class OutlineBuilder extends UnhandledListener {
   }
 
   @override
-  void endMethod(Token getOrSet, Token beginToken, Token endToken) {
+  void endMethod(
+      Token getOrSet, Token beginToken, Token nativeToken, Token endToken) {
     debugEvent("Method");
     MethodBody bodyKind = pop();
     if (bodyKind == MethodBody.RedirectingFactoryBody) {
@@ -917,6 +921,7 @@ class OutlineBuilder extends UnhandledListener {
 
   @override
   void handleRecoverableError(Token token, Message message) {
+    if (message == messageNativeClauseShouldBeAnnotation) return;
     if (silenceParserErrors) {
       debugEvent("RecoverableError");
     } else {