sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 5547397958885d01c71a201e44eef4d18a389458..d2de7a83f4ae3f675627417837add7f8a24fb780 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -26871,13 +26871,13 @@ class Url extends NativeFieldWrapperClass1 {
     if ((blob_OR_source_OR_stream is Blob || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_1(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is MediaSource || blob_OR_source_OR_stream == null)) {
+    if ((blob_OR_source_OR_stream is MediaStream || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_2(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is _WebKitMediaSource || blob_OR_source_OR_stream == null)) {
+    if ((blob_OR_source_OR_stream is MediaSource || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_3(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is MediaStream || blob_OR_source_OR_stream == null)) {
+    if ((blob_OR_source_OR_stream is _WebKitMediaSource || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_4(blob_OR_source_OR_stream);
     }
     throw new ArgumentError("Incorrect number or type of arguments");
@@ -35676,6 +35676,46 @@ get _pureIsolateTimerFactoryClosure =>
   throw new UnimplementedError("Timers on background isolates "
                                "are not supported in the browser"));
 
+class _ScheduleImmediateHelper {

[Emily Fortuna, 2013/10/16 22:54:35]

is this from another CL, perhaps?

+  MutationObserver _observer;
+  final DivElement _div = new DivElement();
+  Function _callback;
+
+  _ScheduleImmediateHelper() {
+    // Mutation events get fired as soon as the current event stack is unwound
+    // so we just make a dummy event and listen for that.
+    _observer = new MutationObserver(_handleMutation);
+    _observer.observe(_div, attributes: true);
+  }
+
+  void _schedule(callback) {
+    if (_callback != null) {
+      throw new StateError(
+          'Only one immediate callback can be scheduled at once');
+    }
+    _callback = callback;
+    // Toggle it to trigger the mutation event.
+    _div.hidden = !_div.hidden;
+  }
+
+  _handleMutation(List<MutationRecord> mutations, MutationObserver observer) {
+    var tmp = _callback;
+    _callback = null;
+    tmp();
+  }
+}
+
+final _ScheduleImmediateHelper _scheduleImmediateHelper =
+    new _ScheduleImmediateHelper();
+
+get _scheduleImmediateClosure => (void callback()) {
+  _scheduleImmediateHelper._schedule(callback);
+};
+
+get _pureIsolateScheduleImmediateClosure => ((void callback()) =>
+  throw new UnimplementedError("scheduleMicrotask in background isolates "
+                               "are not supported in the browser"));
+
 void _initializeCustomElement(Element e) {
   _Utils.initializeCustomElement(e);
 }