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
OffscreenViewProxy* proxy) {
  proxy_views_.erase(proxy);
  Invalidate();
}
void OffScreenRenderWidgetHostView::RegisterGuestViewFrameSwappedCallback(
    content::RenderWidgetHostViewGuest* guest_host_view) {
  guest_host_view->RegisterFrameSwappedCallback(base::BindOnce(
      &OffScreenRenderWidgetHostView::OnGuestViewFrameSwapped,
      weak_ptr_factory_.GetWeakPtr(), base::Unretained(guest_host_view)));
}
void OffScreenRenderWidgetHostView::OnGuestViewFrameSwapped(
    content::RenderWidgetHostViewGuest* guest_host_view) {
  InvalidateBounds(gfx::ConvertRectToPixel(current_device_scale_factor_,
                                           guest_host_view->GetViewBounds()));
  RegisterGuestViewFrameSwappedCallback(guest_host_view);
}
std::unique_ptr<viz::SoftwareOutputDevice>
OffScreenRenderWidgetHostView::CreateSoftwareOutputDevice(
    ui::Compositor* compositor) {
  DCHECK_EQ(GetCompositor(), compositor);
  DCHECK(!copy_frame_generator_);
  DCHECK(!software_output_device_);
  ResizeRootLayer(false);
  software_output_device_ = new OffScreenOutputDevice(
      transparent_, base::Bind(&OffScreenRenderWidgetHostView::OnPaint,
                               weak_ptr_factory_.GetWeakPtr()));
  return base::WrapUnique(software_output_device_);
}
bool OffScreenRenderWidgetHostView::InstallTransparency() {