[ABANDONED] Call Microtask::performCheckpoint for each worker task.

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 109 matching lines @@
     return v8::Local<v8::FunctionTemplate>();
 }
 
 void V8PerIsolateData::setDOMTemplate(void* domTemplateKey, v8::Handle<v8::FunctionTemplate> templ)
 {
     currentDOMTemplateMap().add(domTemplateKey, v8::Eternal<v8::FunctionTemplate>(m_isolate, v8::Local<v8::FunctionTemplate>(templ)));
 }
 
 v8::Local<v8::Context> V8PerIsolateData::ensureDomInJSContext()
 {
-    if (!m_blinkInJSScriptState)
-        m_blinkInJSScriptState = NewScriptState::create(v8::Context::New(m_isolate), DOMWrapperWorld::create());
+    if (!m_blinkInJSScriptState) {
+        v8::Local<v8::Context> context(v8::Context::New(m_isolate));
+        if (context.IsEmpty()) {
+            // The script execution has been terminated.
+            return context;
+        }
+        m_blinkInJSScriptState = NewScriptState::create(context, DOMWrapperWorld::create());
+    }
     return m_blinkInJSScriptState->context();
 }
 
 bool V8PerIsolateData::hasInstance(const WrapperTypeInfo* info, v8::Handle<v8::Value> value)
 {
     return hasInstance(info, value, m_domTemplateMapForMainWorld)
         || hasInstance(info, value, m_domTemplateMapForNonMainWorld);
 }
 
 bool V8PerIsolateData::hasInstance(const WrapperTypeInfo* info, v8::Handle<v8::Value> value, DOMTemplateMap& domTemplateMap)
@@ skipping 43 matching lines @@
 }
 
 v8::Handle<v8::FunctionTemplate> V8PerIsolateData::toStringTemplate()
 {
     if (m_toStringTemplate.isEmpty())
         m_toStringTemplate.set(m_isolate, v8::FunctionTemplate::New(m_isolate, constructorOfToString));
     return m_toStringTemplate.newLocal(m_isolate);
 }
 
 } // namespace WebCore