Add sysexEnabled readonly attribute to MIDIAccess

Source/modules/webmidi/MIDIInput.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 39 matching lines @@
     ScriptWrappable::init(this);
 }
 
 void MIDIInput::didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp)
 {
     ASSERT(isMainThread());
 
     if (!length)
         return;
 
-    // Drop SysEx message here when the client does not request it. Note that this is not a security check but an
-    // automatic filtering for clients that do not want SysEx message. Also note that SysEx message will never be sent
-    // unless the current process has an explicit permission to handle SysEx message.
-    if (data[0] == 0xf0 && !midiAccess()->sysExEnabled())
+    // Drop sysex message here when the client does not request it. Note that this is not a security check but an
+    // automatic filtering for clients that do not want sysex message. Also note that sysex message will never be sent
+    // unless the current process has an explicit permission to handle sysex message.
+    if (data[0] == 0xf0 && !midiAccess()->sysexEnabled())
         return;
     RefPtr<Uint8Array> array = Uint8Array::create(data, length);
     dispatchEvent(MIDIMessageEvent::create(timeStamp, array));
 }
 
 void MIDIInput::trace(Visitor* visitor)
 {
     MIDIPort::trace(visitor);
 }
 
 } // namespace WebCore