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

/cc @brenca @codebytere 
atom/browser/osr/osr_web_contents_view.cc
if (!native_window_)
    return gfx::NativeView();
  return native_window_->GetNativeView();
}
gfx::NativeWindow OffScreenWebContentsView::GetTopLevelNativeWindow() const {
  if (!native_window_)
    return gfx::NativeWindow();
  return native_window_->GetNativeWindow();
}
#endif
void OffScreenWebContentsView::GetContainerBounds(gfx::Rect* out) const {
  *out = GetViewBounds();
}
void OffScreenWebContentsView::SizeContents(const gfx::Size& size) {}
void OffScreenWebContentsView::Focus() {}
void OffScreenWebContentsView::SetInitialFocus() {}
void OffScreenWebContentsView::StoreFocus() {}
void OffScreenWebContentsView::RestoreFocus() {}
void OffScreenWebContentsView::FocusThroughTabTraversal(bool reverse) {}
content::DropData* OffScreenWebContentsView::GetDropData() const {
  return nullptr;
}
gfx::Rect OffScreenWebContentsView::GetViewBounds() const {
  return GetView() ? GetView()->GetViewBounds() : gfx::Rect();
}
void OffScreenWebContentsView::CreateView(const gfx::Size& initial_size,