Trying to make preamble for d8.

sdk/lib/_internal/lib/async_patch.dart

 // 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.
 
 // Patch file for the dart:async library.
 
 import 'dart:_js_helper' show Primitives, convertDartClosureToJS;
 import 'dart:_isolate_helper' show
     IsolateNatives,
     TimerImpl,
     leaveJsAsync,
     enterJsAsync,
-    isWorker;
+    isWorker,
+    globalThis;
 
 import 'dart:_foreign_helper' show JS;
 
 patch Timer _createTimer(Duration duration, void callback()) {
   int milliseconds = duration.inMilliseconds;
   if (milliseconds < 0) milliseconds = 0;
+  if (milliseconds > 0) print("T: $milliseconds");

[floitsch, 2014/03/18 13:18:23]

debug code. (just fyi).

[Lasse Reichstein Nielsen, 2014/03/19 10:24:41]

Done.

   return new TimerImpl(milliseconds, callback);
 }
 
 patch Timer _createPeriodicTimer(Duration duration,
                                  void callback(Timer timer)) {
   int milliseconds = duration.inMilliseconds;
   if (milliseconds < 0) milliseconds = 0;
   return new TimerImpl.periodic(milliseconds, callback);
 }
 
 patch class _AsyncRun {
   patch static void _scheduleImmediate(void callback()) {
+    scheduleImmediateClosure(callback);
+  }
+
+  // Lazily initialized.
+  static final Function scheduleImmediateClosure =
+      _initializeScheduleImmediate();
+
+  static Function _initializeScheduleImmediate() {
+    if (JS('', '#.scheduleImmediate', globalThis) != null) {
+      return _scheduleImmediateJsOverride;
+    }
     // TODO(9002): don't use the Timer to enqueue the immediate callback.
+    // Also check for other JS options like mutation observer or runImmediate.
+    return _scheduleImmediateWithTimer;
+  }
+
+  static void _scheduleImmediateJsOverride(void callback()) {
+    JS('void', '#.scheduleImmediate(#)',
+       globalThis,
+       convertDartClosureToJS(callback, 0));
+  }
+
+  static void _scheduleImmediateWithTimer(void callback()) {
     _createTimer(Duration.ZERO, callback);
   }
 }
 
 patch class DeferredLibrary {
   patch Future<bool> load() {
     List hunkNames = new List();
     if (JS('bool', '\$.libraries_to_load[#] === undefined', libraryName)) {
       return new Future(() => false);
     }
@@ skipping 101 matching lines @@
       completer.completeError(
           new DeferredLoadException("Loading $uri failed."));
     }, 1));
     JS('', 'document.body.appendChild(#)', script);
 
     return completer.future;
   });
 }
 
 bool get _hasDocument => JS('String', 'typeof document') == 'object';