Add handleNoVariableInitializer event.

pkg/front_end/lib/src/fasta/analyzer/ast_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.analyzer.ast_builder;
 
 import 'package:front_end/src/fasta/scanner/token.dart'
     show BeginGroupToken, Token;
 
 import 'package:analyzer/analyzer.dart';
@@ skipping 294 matching lines @@
   void endVariableInitializer(Token assignmentOperator) {
     debugEvent("VariableInitializer");
     assert(assignmentOperator.stringValue == "=");
     Expression initializer = pop();
     Identifier identifier = pop();
     // TODO(ahe): Don't push initializers, instead install them.
     push(ast.variableDeclaration(
         identifier, toAnalyzerToken(assignmentOperator), initializer));
   }
 
+  @override
+  void handleNoVariableInitializer(Token token) {
+    debugEvent("NoVariableInitializer");
+  }
+
   void endInitializedIdentifier() {
     debugEvent("InitializedIdentifier");
     AstNode node = pop();
     VariableDeclaration variable;
     if (node is VariableDeclaration) {
       variable = node;
     } else if (node is SimpleIdentifier) {
       variable = ast.variableDeclaration(node, null, null);
     } else {
       internalError("unhandled identifier: ${node.runtimeType}");
@@ skipping 635 matching lines @@
 /// [ClassDeclaration] or [ClassTypeAlias] object.
 class _MixinApplication {
   final TypeName supertype;
 
   final Token withKeyword;
 
   final List<TypeName> mixinTypes;
 
   _MixinApplication(this.supertype, this.withKeyword, this.mixinTypes);
 }