Experimental `getDiagnostics` request (#24480).

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.
  */
 library to.html;
@@ skipping 370 matching lines @@
         }
       } else if (node is dom.Text) {
         String text = node.text;
         write(text);
       }
     }
   }
 
   @override
   void visitApi() {
-    definedTypes = api.types.keys.toSet();
+    Iterable<TypeDefinition> apiTypes =
+        api.types.where((TypeDefinition td) => !td.experimental);
+    definedTypes = apiTypes.map((TypeDefinition td) => td.name).toSet();
 
     html(() {
       translateHtml(api.html);
     });
   }
 
   @override
   void visitDomain(Domain domain) {
     if (domain.experimental) {
       return;
@@ skipping 82 matching lines @@
         showType('response', request.responseType, request.result);
       });
       translateHtml(request.html);
       describePayload(request.params, 'Parameters');
       describePayload(request.result, 'Returns');
     });
   }
 
   @override
   void visitTypeDefinition(TypeDefinition typeDefinition) {
+    if (typeDefinition.experimental) {
+      return;
+    }
     dt('typeDefinition', () {
       anchor('type_${typeDefinition.name}', () {
         write('${typeDefinition.name}: ');
         TypeVisitor typeVisitor = new TypeVisitor(api, short: true);
         addAll(typeVisitor.collectHtml(() {
           typeVisitor.visitTypeDecl(typeDefinition.type);
         }));
       });
     });
     dd(() {
@@ skipping 198 matching lines @@
     bool verticalBarNeeded = false;
     for (TypeDecl choice in typeUnion.choices) {
       if (verticalBarNeeded) {
         write(' | ');
       }
       visitTypeDecl(choice);
       verticalBarNeeded = true;
     }
   }
 }