 void RenderWidgetHostImpl::RendererIsUnresponsive() {
  NotificationService::current()->Notify(
      NOTIFICATION_RENDER_WIDGET_HOST_HANG,
      Source<RenderWidgetHost>(this),
      NotificationService::NoDetails());
  is_unresponsive_ = true;
  if (delegate_)
    delegate_->RendererUnresponsive(this);
}

Unknown