PFNGLASYNCMARKERSGIXPROCDart typedef
        PFNGLASYNCMARKERSGIXPROCDart =
     void Function(int marker)
    
    
    
Implementation
typedef PFNGLASYNCMARKERSGIXPROCDart = void Function(int marker);typedef PFNGLASYNCMARKERSGIXPROCDart = void Function(int marker);