Add experimental attribute to requests (recreated due to git failure)

pkg/analysis_server/tool/spec/from_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 reading an HTML API description.
  */
 library from.html;
 
 import 'dart:io';
@@ skipping 376 matching lines @@
  * <params> and <result> have the same form as <object>, as described in
  * [typeDeclFromHtml].
  *
  * Child elements can occur in any order.
  */
 Request requestFromHtml(dom.Element html, String context) {
   String domainName = getAncestor(html, 'domain', context).attributes['name'];
   checkName(html, 'request', context);
   String method = html.attributes['method'];
   context = '$context.${method != null ? method : 'method'}';
-  checkAttributes(html, ['method'], context);
+  checkAttributes(html, ['method'], context,
+      optionalAttributes: ['experimental']);
+  bool experimental = html.attributes['experimental'] == 'true';
   TypeDecl params;
   TypeDecl result;
   recurse(html, context, {
     'params': (dom.Element child) {
       params = typeObjectFromHtml(child, '$context.params');
     },
     'result': (dom.Element child) {
       result = typeObjectFromHtml(child, '$context.result');
     }
   });
-  return new Request(domainName, method, params, result, html);
+  return new Request(domainName, method, params, result, html,
+      experimental: experimental);
 }
 
 /**
  * Create a [TypeDefinition] object from an HTML representation such as:
  *
  * <type name="typeName">
  *   TYPE
  * </type>
  *
  * Where TYPE is any HTML that can be parsed by [typeDeclFromHtml].
@@ skipping 127 matching lines @@
       TypeDefinition typeDefinition = typeDefinitionFromHtml(child);
       types[typeDefinition.name] = typeDefinition;
     }
   });
   return new Types(types, html);
 }
 
 typedef void ElementProcessor(dom.Element element);
 
 typedef void TextProcessor(dom.Text text);