[v8 gc] Introduce a base class for all objects that can have pending activity

third_party/WebKit/Source/core/dom/MessagePort.cpp

 /*
  * Copyright (C) 2008 Apple 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 33 matching lines @@
 namespace blink {
 
 MessagePort* MessagePort::create(ExecutionContext& executionContext)
 {
     MessagePort* port = new MessagePort(executionContext);
     port->suspendIfNeeded();
     return port;
 }
 
 MessagePort::MessagePort(ExecutionContext& executionContext)
-    : ActiveDOMObject(&executionContext)
+    : ActiveScriptWrappable(this)
+    , ActiveDOMObject(&executionContext)
     , m_started(false)
     , m_closed(false)
     , m_weakFactory(this)
 {
 }
 
 MessagePort::~MessagePort()
 {
     close();
     if (m_scriptStateForConversion)
@@ skipping 227 matching lines @@
 {
     ASSERT(getExecutionContext());
     if (!m_scriptStateForConversion) {
         v8::Isolate* isolate = scriptIsolate();
         m_scriptStateForConversion = ScriptState::create(v8::Context::New(isolate), DOMWrapperWorld::create(isolate));
     }
     return m_scriptStateForConversion->context();
 }
 
 } // namespace blink