Add handleNoVariableInitializer event.

pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart

Index: pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart b/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
index b78722916faaae87d166f5459828fc0ddad2aa15..0a9fe2d03560ebe53232ee64ae9a1cdafcb6d558 100644
--- a/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
+++ b/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
@@ -312,6 +312,11 @@ class AstBuilder extends ScopeListener {
         identifier, toAnalyzerToken(assignmentOperator), initializer));
   }
 
+  @override
+  void handleNoVariableInitializer(Token token) {
+    debugEvent("NoVariableInitializer");
+  }
+
   void endInitializedIdentifier() {
     debugEvent("InitializedIdentifier");
     AstNode node = pop();