Revert "Revert "Blob constructor""

lib/dom/frog/dom_frog.dart

Index: lib/dom/frog/dom_frog.dart
diff --git a/lib/dom/frog/dom_frog.dart b/lib/dom/frog/dom_frog.dart
index 3e3b871c883ed70b253ff7af79cbfb5994c799c2..56ed64a229102c1cc556a673ac5a49efcdad1ce6 100644
--- a/lib/dom/frog/dom_frog.dart
+++ b/lib/dom/frog/dom_frog.dart
@@ -11938,6 +11938,14 @@ class _XSLTProcessorJs extends _DOMTypeJs implements XSLTProcessor native "*XSLT
 // 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.
 
+class _BlobFactoryProvider {
+  factory Blob(List blobParts, [String type = null, String endings = null]) native
+      '''return new Blob(blobParts, type, endings);''';
+}
+// 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.
+
 class _DOMParserFactoryProvider {
   factory DOMParser() native
       '''return new DOMParser();''';
@@ -12620,7 +12628,9 @@ interface BiquadFilterNode extends AudioNode {
 
 // WARNING: Do not edit - generated code.
 
-interface Blob {
+interface Blob default _BlobFactoryProvider {
+
+  Blob(List blobParts, [String type, String endings]);
 
   final int size;