Move microtask queueing logic from JavaScript to C++

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 98fe997d7275bef4f635376b11e48a998d111c0c..7fd09220437f63e4776d716e076a5fc645742d28 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -14878,31 +14878,23 @@ RUNTIME_FUNCTION(Runtime_SetIsObserved) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_SetMicrotaskPending) {
-  SealHandleScope shs(isolate);
+RUNTIME_FUNCTION(Runtime_EnqueueMicrotask) {
+  HandleScope scope(isolate);
   ASSERT(args.length() == 1);
-  CONVERT_BOOLEAN_ARG_CHECKED(new_state, 0);
-  bool old_state = isolate->microtask_pending();
-  isolate->set_microtask_pending(new_state);
-  return isolate->heap()->ToBoolean(old_state);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, microtask, 0);
+  isolate->EnqueueMicrotask(microtask);
+  return isolate->heap()->undefined_value();
 }
 
 
 RUNTIME_FUNCTION(Runtime_RunMicrotasks) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 0);
-  if (isolate->microtask_pending()) Execution::RunMicrotasks(isolate);
+  isolate->RunMicrotasks();
   return isolate->heap()->undefined_value();
 }
 
 
-RUNTIME_FUNCTION(Runtime_GetMicrotaskState) {
-  SealHandleScope shs(isolate);
-  ASSERT(args.length() == 0);
-  return isolate->heap()->microtask_state();
-}
-
-
 RUNTIME_FUNCTION(Runtime_GetObservationState) {
   SealHandleScope shs(isolate);
   ASSERT(args.length() == 0);