Move microtask queueing logic from JavaScript to C++

src/v8natives.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file relies on the fact that the following declarations have been made
 // in runtime.js:
 // var $Object = global.Object;
 // var $Boolean = global.Boolean;
 // var $Number = global.Number;
 // var $Function = global.Function;
@@ skipping 1844 matching lines @@
   %SetCode($Function, FunctionConstructor);
   %SetProperty($Function.prototype, "constructor", $Function, DONT_ENUM);
 
   InstallFunctions($Function.prototype, DONT_ENUM, $Array(
     "bind", FunctionBind,
     "toString", FunctionToString
   ));
 }
 
 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.
-
-function RunMicrotasksJS() {
-  while (%SetMicrotaskPending(false)) {
-    var microtaskState = %GetMicrotaskState();
-    if (IS_UNDEFINED(microtaskState.queue))
-      return;
-
-    var microtasks = microtaskState.queue;
-    microtaskState.queue = null;
-
-    for (var i = 0; i < microtasks.length; i++) {
-      microtasks[i]();
-    }
-  }
-}
-
-function EnqueueMicrotask(fn) {
-  var microtaskState = %GetMicrotaskState();
-  if (IS_UNDEFINED(microtaskState.queue) || IS_NULL(microtaskState.queue)) {
-    microtaskState.queue = new InternalArray;
-  }
-  microtaskState.queue.push(fn);
-  %SetMicrotaskPending(true);
-}