message: Set message source for API-captured debug messages on GL.
diff: @@ -2984,8 +2984,10 @@ void WrappedOpenGL::DebugSnoop(GLenum source, GLenum type, GLuint id, GLenum sev
  {
  DebugMessage msg;
  + msg.eventId = 0;
  msg.messageID = id;
  msg.description = string(message, message + length);
  + msg.source = MessageSource::API;
  switch(severity)
  {
  