Prepare for development branch by updating externally-used API.

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

Index: pkg/front_end/lib/src/fasta/source/stack_listener.dart
diff --git a/pkg/front_end/lib/src/fasta/source/stack_listener.dart b/pkg/front_end/lib/src/fasta/source/stack_listener.dart
index e35f1414648748af5a528d18f33f91e200b20008..c133b207ab13676aa3108f8596bc63df7bffbfff 100644
--- a/pkg/front_end/lib/src/fasta/source/stack_listener.dart
+++ b/pkg/front_end/lib/src/fasta/source/stack_listener.dart
@@ -247,6 +247,8 @@ abstract class StackListener extends Listener {
     super.handleRecoverableError(token, message);
   }
 
+  void addCompileTimeErrorFromMessage(FastaMessage message);
+
   @override
   Token handleUnrecoverableError(Token token, FastaMessage message) {
     throw inputError(uri, token.charOffset, message.message);