Move microtask queueing logic from JavaScript to C++

src/api.cc

 // 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.
 
 #include "api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #include <cmath>  // For isnan.
 #include "../include/v8-debug.h"
 #include "../include/v8-profiler.h"
@@ skipping 6608 matching lines @@
 }
 
 
 void Isolate::RemoveCallCompletedCallback(CallCompletedCallback callback) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   isolate->RemoveCallCompletedCallback(callback);
 }
 
 
 void Isolate::RunMicrotasks() {
-  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(this);
-  i::HandleScope scope(i_isolate);
-  i_isolate->RunMicrotasks();
+  reinterpret_cast<i::Isolate*>(this)->RunMicrotasks();
 }
 
 
 void Isolate::EnqueueMicrotask(Handle<Function> microtask) {
-  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(this);
-  ENTER_V8(i_isolate);
-  i::Execution::EnqueueMicrotask(i_isolate, Utils::OpenHandle(*microtask));
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->EnqueueMicrotask(Utils::OpenHandle(*microtask));
 }
 
 
 void Isolate::SetAutorunMicrotasks(bool autorun) {
   reinterpret_cast<i::Isolate*>(this)->set_autorun_microtasks(autorun);
 }
 
 
 bool Isolate::WillAutorunMicrotasks() const {
   return reinterpret_cast<const i::Isolate*>(this)->autorun_microtasks();
@@ skipping 892 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal