Prepare for development branch by updating externally-used API.

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 '../fasta_codes.dart' show FastaMessage, codeExpectedBlockToSkip;
 
@@ skipping 770 matching lines @@
       Token recover = target.skipNativeClause(token);
       if (recover != null) {
         nativeMethodName = target.extractNativeMethodName(token);
         return recover;
       }
     }
     return super.handleUnrecoverableError(token, message);
   }
 
   @override
+  void addCompileTimeErrorFromMessage(FastaMessage message) {
+    library.addCompileTimeError(message.charOffset, message.message,
+        fileUri: message.uri);
+  }
+
+  @override
   Link<Token> handleMemberName(Link<Token> identifiers) {
     if (!isDartLibrary || identifiers.isEmpty) return identifiers;
     return removeNativeClause(identifiers);
   }
 
   @override
   void debugEvent(String name) {
     // printEvent(name);
   }
 }