Support experimental annotations for the analysis server spec.

pkg/analysis_server/tool/spec/to_html.dart

 // Copyright (c) 2014, 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.
 
 /**
  * Code for displaying the API as HTML.  This is used both for generating a
  * full description of the API as a web page, and for generating doc comments
  * in generated code.
  */
 import 'dart:convert';
@@ skipping 522 matching lines @@
         write('Notifications');
       });
       dl(() {
         domain.notifications.forEach(visitNotification);
       });
     }
   }
 
   @override
   void visitNotification(Notification notification) {
+    if (notification.experimental) {
+      return;
+    }
     dt('notification', () {
       anchor('notification_${notification.longEvent}', () {
         write(notification.longEvent);
       });
     });
     dd(() {
       box(() {
         showType(
             'notification', notification.notificationType, notification.params);
       });
@@ skipping 266 matching lines @@
     bool verticalBarNeeded = false;
     for (TypeDecl choice in typeUnion.choices) {
       if (verticalBarNeeded) {
         write(' | ');
       }
       visitTypeDecl(choice);
       verticalBarNeeded = true;
     }
   }
 }