Implement scheduleImmediate for the VM.

runtime/lib/schedule_immediate_patch.dart

+// Copyright (c) 2013, 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 void scheduleImmediate(void callback()) {
+  if (scheduleImmediateClosure == null) {
+    throw new UnsupportedError("microtasks are not supported");
+  }
+  scheduleImmediateClosure(callback);
+}
+
+typedef void ScheduleImmediateClosure(void callback());
+
+ScheduleImmediateClosure scheduleImmediateClosure;

[Ivan Posva, 2013/11/27 22:08:32]

Why is this public?

[floitsch, 2013/11/28 19:05:54]

It is inside the collection-dev library (thus not publicly visible).
However that was, so that isolates could automatically take over the microtask
queue.
Now that the embedder is responsible for it I will move it back to the
async-library and make it private again.

+
+void setScheduleImmediateClosure(ScheduleImmediateClosure closure) {
+  scheduleImmediateClosure = closure;
+}