Enqueue Blink microtasks using V8's C++ API

Source/core/dom/Microtask.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 33 matching lines @@
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     V8PerIsolateData* isolateData = V8PerIsolateData::from(isolate);
     ASSERT(isolateData);
     if (isolateData->recursionLevel() || isolateData->performingMicrotaskCheckpoint())
         return;
     isolateData->setPerformingMicrotaskCheckpoint(true);
     isolate->RunMicrotasks();
     isolateData->setPerformingMicrotaskCheckpoint(false);
 }
 
-static void microtaskFunctionCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
+static void microtaskFunctionCallback(void* data)
 {
-    OwnPtr<blink::WebThread::Task> task = adoptPtr(static_cast<blink::WebThread::Task*>(info.Data().As<v8::External>()->Value()));
+    OwnPtr<blink::WebThread::Task> task = adoptPtr(static_cast<blink::WebThread::Task*>(data));
     task->run();
 }
 
 void Microtask::enqueueMicrotask(PassOwnPtr<blink::WebThread::Task> callback)
 {
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
-    V8PerIsolateData* isolateData = V8PerIsolateData::from(isolate);
-    v8::HandleScope handleScope(isolate);
-    v8::Local<v8::Context> context = isolateData->ensureDomInJSContext();
-    ASSERT(!context.IsEmpty());
-    v8::Context::Scope scope(context);
-    v8::Local<v8::External> handler = v8::External::New(isolate, callback.leakPtr());
-    isolate->EnqueueMicrotask(v8::Function::New(isolate, &microtaskFunctionCallback, handler));
+    isolate->EnqueueMicrotask(&microtaskFunctionCallback, callback.leakPtr());
 }
 
 void Microtask::enqueueMicrotask(const Closure& callback)
 {
     enqueueMicrotask(adoptPtr(new Task(callback)));
 }
 
 } // namespace WebCore