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

third_party/WebKit/Source/modules/webmidi/MIDIPort.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
 #include "bindings/core/v8/ScriptPromise.h"
 #include "core/dom/DOMException.h"
 #include "modules/webmidi/MIDIAccess.h"
 #include "modules/webmidi/MIDIConnectionEvent.h"
 
 namespace blink {
 
 using PortState = MIDIAccessor::MIDIPortState;
 
 MIDIPort::MIDIPort(MIDIAccess* access, const String& id, const String& manufacturer, const String& name, TypeCode type, const String& version, PortState state)
-    : ActiveDOMObject(access->getExecutionContext())
+    : ActiveScriptWrappable(this)
+    , ActiveDOMObject(access->getExecutionContext())
     , m_id(id)
     , m_manufacturer(manufacturer)
     , m_name(name)
     , m_type(type)
     , m_version(version)
     , m_access(access)
     , m_connection(ConnectionStateClosed)
 {
     ASSERT(access);
     ASSERT(type == TypeInput || type == TypeOutput);
@@ skipping 141 matching lines @@
     ASSERT(state != PortState::MIDIPortStateDisconnected || connection != ConnectionStateOpen);
     if (m_state == state && m_connection == connection)
         return;
     m_state = state;
     m_connection = connection;
     dispatchEvent(MIDIConnectionEvent::create(this));
     m_access->dispatchEvent(MIDIConnectionEvent::create(this));
 }
 
 } // namespace blink