Implement SetWrapperReferenceTo idl attribute within traceWrappers for MIDIInput and MIDIOutput

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 149 matching lines @@
     m_connection = ConnectionStateClosed;
 }
 
 DEFINE_TRACE(MIDIPort)
 {
     visitor->trace(m_access);
     EventTargetWithInlineData::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
+DEFINE_TRACE_WRAPPERS(MIDIPort)
+{
+    visitor->traceWrappers(m_access);
+}
+
 void MIDIPort::open()
 {
     switch (m_state) {
     case PortState::MIDIPortStateDisconnected:
         setStates(m_state, ConnectionStatePending);
         break;
     case PortState::MIDIPortStateConnected:
         // TODO(toyoshim): Add blink API to perform a real open and close
         // operation.
         setStates(m_state, ConnectionStateOpen);
@@ skipping 16 matching lines @@
     DCHECK(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