Add handleNoVariableInitializer event.

pkg/front_end/lib/src/fasta/parser/parser.dart

 // Copyright (c) 2012, 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.parser.parser;
 
 import '../scanner.dart' show
     ErrorToken;
 
 import '../scanner/recover.dart' show
@@ skipping 1235 matching lines @@
     }
     return token;
   }
 
   Token parseVariableInitializerOpt(Token token) {
     if (optional('=', token)) {
       Token assignment = token;
       listener.beginVariableInitializer(token);
       token = parseExpression(token.next);
       listener.endVariableInitializer(assignment);
+    } else {
+      listener.handleNoVariableInitializer(token);
     }
     return token;
   }
 
   Token parseInitializersOpt(Token token) {
     if (optional(':', token)) {
       return parseInitializers(token);
     } else {
       listener.handleNoInitializers();
       return token;
@@ skipping 2047 matching lines @@
         break;
     }
     if (isRecoverable) {
       listener.handleRecoverableError(token, kind, arguments);
       return null;
     } else {
       return listener.handleUnrecoverableError(token, kind, arguments);
     }
   }
 }