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
return GetDelegatedFrameHost()->CanCopyFromCompositingSurface();
}
void OffScreenRenderWidgetHostView::Show() {
  if (is_showing_)
    return;
  is_showing_ = true;
#if defined(OS_MACOSX)
  browser_compositor_->SetRenderWidgetHostIsHidden(false);
#else
  delegated_frame_host_->AttachToCompositor(compositor_.get());
  delegated_frame_host_->WasShown(GetLocalSurfaceId(),
                                  GetRootLayer()->bounds().size(), false);
#endif
  if (render_widget_host_)
    render_widget_host_->WasShown(false);
}
void OffScreenRenderWidgetHostView::Hide() {
  if (!is_showing_)
    return;
  if (render_widget_host_)
    render_widget_host_->WasHidden();
#if defined(OS_MACOSX)
  browser_compositor_->SetRenderWidgetHostIsHidden(true);
#else
  GetDelegatedFrameHost()->WasHidden();
  GetDelegatedFrameHost()->DetachFromCompositor();
#endif
  is_showing_ = false;
}
bool OffScreenRenderWidgetHostView::IsShowing() {