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

third_party/WebKit/Source/modules/webmidi/MIDIAccess.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 30 matching lines @@
 #include "modules/webmidi/MIDIOutput.h"
 #include "modules/webmidi/MIDIOutputMap.h"
 #include "modules/webmidi/MIDIPort.h"
 #include "platform/AsyncMethodRunner.h"
 
 namespace blink {
 
 using PortState = MIDIAccessor::MIDIPortState;
 
 MIDIAccess::MIDIAccess(PassOwnPtr<MIDIAccessor> accessor, bool sysexEnabled, const Vector<MIDIAccessInitializer::PortDescriptor>& ports, ExecutionContext* executionContext)
-    : ActiveDOMObject(executionContext)
+    : ActiveScriptWrappable(this)
+    , ActiveDOMObject(executionContext)
     , m_accessor(accessor)
     , m_sysexEnabled(sysexEnabled)
     , m_hasPendingActivity(false)
 {
     m_accessor->setClient(this);
     for (size_t i = 0; i < ports.size(); ++i) {
         const MIDIAccessInitializer::PortDescriptor& port = ports[i];
         if (port.type == MIDIPort::TypeInput) {
             m_inputs.append(MIDIInput::create(this, port.id, port.manufacturer, port.name, port.version, port.state));
         } else {
@@ skipping 139 matching lines @@
 
 DEFINE_TRACE(MIDIAccess)
 {
     visitor->trace(m_inputs);
     visitor->trace(m_outputs);
     RefCountedGarbageCollectedEventTargetWithInlineData<MIDIAccess>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink