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
const {
  return background_color_;
}
void OffScreenRenderWidgetHostView::UpdateBackgroundColor() {
  NOTREACHED();
}
gfx::Size OffScreenRenderWidgetHostView::GetVisibleViewportSize() const {
  return size_;
}
void OffScreenRenderWidgetHostView::SetInsets(const gfx::Insets& insets) {}
bool OffScreenRenderWidgetHostView::LockMouse() {
  return false;
}
void OffScreenRenderWidgetHostView::UnlockMouse() {}
void OffScreenRenderWidgetHostView::TakeFallbackContentFrom(
    content::RenderWidgetHostView* view) {
  DCHECK(!static_cast<content::RenderWidgetHostViewBase*>(view)
              ->IsRenderWidgetHostViewChildFrame());
  DCHECK(!static_cast<content::RenderWidgetHostViewBase*>(view)
              ->IsRenderWidgetHostViewGuest());
  OffScreenRenderWidgetHostView* view_osr =
      static_cast<OffScreenRenderWidgetHostView*>(view);
  SetBackgroundColor(view_osr->background_color_);
  if (GetDelegatedFrameHost() && view_osr->GetDelegatedFrameHost()) {
    GetDelegatedFrameHost()->TakeFallbackContentFrom(
        view_osr->GetDelegatedFrameHost());
  }
  host()->GetContentRenderingTimeoutFrom(view_osr->host());
}
void OffScreenRenderWidgetHostView::DidCreateNewRendererCompositorFrameSink(