Support for parsing HTML in the new task model

pkg/analyzer/lib/src/plugin/engine_plugin.dart

Index: pkg/analyzer/lib/src/plugin/engine_plugin.dart
diff --git a/pkg/analyzer/lib/src/plugin/engine_plugin.dart b/pkg/analyzer/lib/src/plugin/engine_plugin.dart
index 769d18f433ae1dc6ba61be5a7d0f348745253f77..64f7672af29f408b78f42bf7b9e4314f46bfd59d 100644
--- a/pkg/analyzer/lib/src/plugin/engine_plugin.dart
+++ b/pkg/analyzer/lib/src/plugin/engine_plugin.dart
@@ -7,6 +7,7 @@ library analyzer.src.plugin.engine_plugin;
 import 'package:analyzer/plugin/task.dart';
 import 'package:analyzer/src/task/dart.dart';
 import 'package:analyzer/src/task/general.dart';
+import 'package:analyzer/src/task/html.dart';
 import 'package:analyzer/task/model.dart';
 import 'package:plugin/plugin.dart';
 
@@ -93,6 +94,7 @@ class EnginePlugin implements Plugin {
     //
     // Register HTML tasks.
     //
+    registerExtension(taskId, ParseHtmlTask.DESCRIPTOR);
   }
 
   /**