Implementing window.createObjectURL*

lib/html/dart2js/html_dart2js.dart

Index: lib/html/dart2js/html_dart2js.dart
diff --git a/lib/html/dart2js/html_dart2js.dart b/lib/html/dart2js/html_dart2js.dart
index b5f3864e29a456a43eabccd93c282b8133fd4f3b..bd27352c63e3df2e74e6ee4932502d146e0eb2fb 100644
--- a/lib/html/dart2js/html_dart2js.dart
+++ b/lib/html/dart2js/html_dart2js.dart
@@ -17426,6 +17426,13 @@ class _WindowImpl extends _EventTargetImpl implements Window native "@*DOMWindow
     localStorage['dart-port:$name'] = JSON.stringify(serialized);
   }
 
+  String createObjectUrl(object) native '''
+    return (window.URL || window.webkitURL).createObjectURL(object)
+  ''';
+
+  void revokeObjectUrl(String objectUrl) native '''
+    (window.URL || window.webkitURL).revokeObjectURL(objectUrl)
+  ''';
 
   _WindowEventsImpl get on() =>
     new _WindowEventsImpl(this);
@@ -36352,6 +36359,16 @@ interface Window extends EventTarget {
 
   IDBFactory get indexedDB();
 
+  /**
+   * Creates a new object URL for the specified object. The URL will be
+   * available until revokeObjectUrl is called.
+   * [object] can be a Blob, MediaStream or MediaSource.
+   */
+  String createObjectUrl(object);
+
+  /** @domName DOMURL.revokeObjectURL */
+  void revokeObjectUrl(String objectUrl);
+
 
   /**
    * @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent