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

pkg/analysis_server/tool/spec/to_html.dart

Index: pkg/analysis_server/tool/spec/to_html.dart
diff --git a/pkg/analysis_server/tool/spec/to_html.dart b/pkg/analysis_server/tool/spec/to_html.dart
index 5debe85f9789e9761c7e69e3836fdf74b36add69..e9401960fe786cb3363d8afd0240dab8a2848efc 100644
--- a/pkg/analysis_server/tool/spec/to_html.dart
+++ b/pkg/analysis_server/tool/spec/to_html.dart
@@ -329,11 +329,13 @@ class ToHtmlVisitor extends HierarchicalApiVisitor
     h5(() => write("Requests"));
     element('ul', {}, () {
       for (var request in requests) {
-        element(
-            'li',
-            {},
-            () => link(
-                'request_${request.longMethod}', () => write(request.method)));
+        if (!request.experimental) {
+          element(
+              'li',
+              {},
+              () => link('request_${request.longMethod}',
+                  () => write(request.method)));
+        }
       }
     });
   }
@@ -551,6 +553,9 @@ class ToHtmlVisitor extends HierarchicalApiVisitor
 
   @override
   void visitRequest(Request request) {
+    if (request.experimental) {
+      return;
+    }
     dt('request', () {
       anchor('request_${request.longMethod}', () {
         write(request.longMethod);