Adding supported checks & test for SpeechRecognition APIs.

tools/dom/templates/html/impl/impl_Event.darttemplate

 // Copyright (c) 2012, 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.
 
 // WARNING: Do not edit - generated code.
 
 part of html;
 
 $(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   // In JS, canBubble and cancelable are technically required parameters to
   // init*Event. In practice, though, if they aren't provided they simply
   // default to false (since that's Boolean(undefined)).
   //
   // Contrary to JS, we default canBubble and cancelable to true, since that's
   // what people want most of the time anyway.
-  factory $CLASSNAME(String type, [bool canBubble = true, bool cancelable = true]) =>
-      _$(CLASSNAME)FactoryProvider.create$CLASSNAME(type, canBubble, cancelable);
+  factory $CLASSNAME(String type,
+      [bool canBubble = true, bool cancelable = true]) {
+    return new Event.type('Event', type, canBubble, cancelable);
+  }
+
+  /**
+   * Creates a new Event object of the specified type.
+   *
+   * This is analogous to document.createEvent.
+   * Normally events should be created via their constructors, if available.
+   *
+   *     var e = new Event.type('MouseEvent', 'mousedown', true, true);
+   */
+  factory Event.type(String eventType, String type, [bool canBubble = true,
+      bool cancelable = true]) {
+    final Event e = document.$dom_createEvent(eventType);
+    e.$dom_initEvent(type, canBubble, cancelable);
+    return e;
+  }
 $!MEMBERS
 }