Create & use microtask work queue

Source/bindings/v8/V8PerIsolateData.cpp

 /*
  * Copyright (C) 2009 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 28 matching lines @@
     : m_isolate(isolate)
     , m_stringCache(adoptPtr(new StringCache()))
     , m_workerDomDataStore(0)
     , m_constructorMode(ConstructorMode::CreateNewObject)
     , m_recursionLevel(0)
 #ifndef NDEBUG
     , m_internalScriptRecursionLevel(0)
 #endif
     , m_gcEventData(adoptPtr(new GCEventData()))
     , m_shouldCollectGarbageSoon(false)
+    , m_performingMicrotaskCheckpoint(false)
 {
 }
 
 V8PerIsolateData::~V8PerIsolateData()
 {
 }
 
 V8PerIsolateData* V8PerIsolateData::create(v8::Isolate* isolate)
 {
     ASSERT(isolate);
@@ skipping 96 matching lines @@
     // obscure and unlikely to be a problem.
     v8::Handle<v8::Value> value = info.Callee()->Get(v8AtomicString(info.GetIsolate(), "toString"));
     if (!value->IsFunction()) {
         v8SetReturnValue(info, v8::String::Empty(info.GetIsolate()));
         return;
     }
     v8SetReturnValue(info, V8ScriptRunner::callInternalFunction(v8::Handle<v8::Function>::Cast(value), info.This(), 0, 0, v8::Isolate::GetCurrent()));
 }
 
 } // namespace WebCore