Got disabled in chromium 71 upgrade https://github.com/electron/electron/commit/798b2a3ffd55c477af6258f0afb71000c9f8ecde

/cc @brenca @codebytere 
atom/browser/osr/osr_render_widget_host_view.cc
OffScreenRenderWidgetHostView* guest_host) {
  guest_host_views_.insert(guest_host);
}
void OffScreenRenderWidgetHostView::RemoveGuestHostView(
    OffScreenRenderWidgetHostView* guest_host) {
  guest_host_views_.erase(guest_host);
}
void OffScreenRenderWidgetHostView::AddViewProxy(OffscreenViewProxy* proxy) {
  proxy->SetObserver(this);
  proxy_views_.insert(proxy);
}
void OffScreenRenderWidgetHostView::RemoveViewProxy(OffscreenViewProxy* proxy) {
  proxy->RemoveObserver();
  proxy_views_.erase(proxy);
}
void OffScreenRenderWidgetHostView::ProxyViewDestroyed(