1. @DomName('WebGL2RenderingContext.clientWaitSync')
  2. @DocsEditable()
  3. @Experimental()
int clientWaitSync(Sync sync, int flags, int timeout)

Source 

@DomName('WebGL2RenderingContext.clientWaitSync')
@DocsEditable()
@Experimental() // untriaged
int clientWaitSync(Sync sync, int flags, int timeout) =>
    _blink.BlinkWebGL2RenderingContext.instance
        .clientWaitSync_Callback_3_(this, sync, flags, timeout);