Harmony promises

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index 995e7d83ed11fe4f21f7c65b413391b83c832b6b..c20818cecdd9582730659303c20d83d401a23c75 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -1837,3 +1837,18 @@ function SetUpFunction() {
 }
 
 SetUpFunction();
+
+
+//----------------------------------------------------------------------------
+
+// TODO(rossberg): very simple abstraction for generic microtask queue.
+// Eventually, we should move to a real event queue that allows to maintain
+// relative ordering of different kinds of tasks.
+
+RunMicrotasks.runners = new InternalArray;
+
+function RunMicrotasks() {
+  while (%SetMicrotasksPending(false)) {
+    for (var i in RunMicrotasks.runners) RunMicrotasks.runners[i]();
+  }
+}