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

/cc @brenca @codebytere 
atom/browser/osr/osr_web_contents_view.cc
#endif  
void OffScreenWebContentsView::StartDragging(
    const content::DropData& drop_data,
    blink::WebDragOperationsMask allowed_ops,
    const gfx::ImageSkia& image,
    const gfx::Vector2d& image_offset,
    const content::DragEventSourceInfo& event_info,
    content::RenderWidgetHostImpl* source_rwh) {
  if (web_contents_)
    web_contents_->SystemDragEnded(source_rwh);
}
void OffScreenWebContentsView::UpdateDragCursor(
    blink::WebDragOperation operation) {}
void OffScreenWebContentsView::SetPainting(bool painting) {
  auto* view = GetView();
  if (view != nullptr) {
    view->SetPainting(painting);
  } else {
    painting_ = painting;
  }
}
bool OffScreenWebContentsView::IsPainting() const {
  auto* view = GetView();
  if (view != nullptr) {
    return view->IsPainting();
  } else {
    return painting_;
  }
}
void OffScreenWebContentsView::SetFrameRate(int frame_rate) {