Parse optional and named parameters.

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 a5d08dd00323c0a8d710fdd8d2507f562f32b250..56d8b4f248148bd2483edcea8a25e0ebc84b9fb9 100644
--- a/pkg/front_end/lib/src/fasta/source/outline_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
@@ -372,7 +372,7 @@ class OutlineBuilder extends UnhandledListener {
   }
 
   @override
-  void endFormalParameter(Token thisKeyword) {
+  void endFormalParameter(Token thisKeyword, FormalParameterType kind) {
     debugEvent("FormalParameter");
     String name = pop();
     TypeBuilder type = pop();
@@ -390,6 +390,12 @@ class OutlineBuilder extends UnhandledListener {
   }
 
   @override
+  void handleFormalParameterWithoutValue(Token token) {
+    debugEvent("FormalParameterWithoutValue");
+    // Ignored for now.
+  }
+
+  @override
   void endFunctionTypedFormalParameter(Token token) {
     debugEvent("FunctionTypedFormalParameter");
     pop(); // Function type parameters.