Implement SetWrapperReferenceTo idl attribute within traceWrappers for MIDIInput and MIDIOutput

third_party/WebKit/Source/modules/webmidi/MIDIPort.h

 /*
  * 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 60 matching lines @@
     ScriptPromise open(ScriptState*);
     ScriptPromise close(ScriptState*);
 
     MIDIAccess* midiAccess() const { return m_access; }
     MIDIAccessor::MIDIPortState getState() const { return m_state; }
     void setState(MIDIAccessor::MIDIPortState);
     ConnectionState getConnection() const { return m_connection; }
 
     DECLARE_VIRTUAL_TRACE();
 
+    DECLARE_VIRTUAL_TRACE_WRAPPERS();
+
     DEFINE_ATTRIBUTE_EVENT_LISTENER(statechange);
 
     // EventTarget
     const AtomicString& interfaceName() const override { return EventTargetNames::MIDIPort; }
     ExecutionContext* getExecutionContext() const final;
 
     // ActiveScriptWrappable
     bool hasPendingActivity() const final;
 
     // ActiveDOMObject
@@ skipping 16 matching lines @@
     TypeCode m_type;
     String m_version;
     Member<MIDIAccess> m_access;
     MIDIAccessor::MIDIPortState m_state;
     ConnectionState m_connection;
 };
 
 } // namespace blink
 
 #endif // MIDIPort_h