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

/cc @brenca @codebytere 
atom/browser/osr/osr_render_widget_host_view.h
return last_frame_root_background_color_;
  }
#endif
  void CancelWidget();
  void AddGuestHostView(OffScreenRenderWidgetHostView* guest_host);
  void RemoveGuestHostView(OffScreenRenderWidgetHostView* guest_host);
  void AddViewProxy(OffscreenViewProxy* proxy);
  void RemoveViewProxy(OffscreenViewProxy* proxy);
  void ProxyViewDestroyed(OffscreenViewProxy* proxy) override;
  void RegisterGuestViewFrameSwappedCallback(
      content::RenderWidgetHostViewGuest* guest_host_view);
  void OnGuestViewFrameSwapped(
      content::RenderWidgetHostViewGuest* guest_host_view);
  void OnPaint(const gfx::Rect& damage_rect, const SkBitmap& bitmap);
  void OnPopupPaint(const gfx::Rect& damage_rect, const SkBitmap& bitmap);
  void OnProxyViewPaint(const gfx::Rect& damage_rect) override;
  bool IsPopupWidget() const { return popup_type_ != blink::kWebPopupTypeNone; }
  void HoldResize();
  void ReleaseResize();
  void SynchronizeVisualProperties();
  void SendMouseEvent(const blink::WebMouseEvent& event);
  void SendMouseWheelEvent(const blink::WebMouseWheelEvent& event);
  void SetPainting(bool painting);
  bool IsPainting() const;
  void SetFrameRate(int frame_rate);
  int GetFrameRate() const;
  ui::Compositor* GetCompositor() const;
  ui::Layer* GetRootLayer() const;
#if defined(OS_MACOSX)
  content::BrowserCompositorMac* browser_compositor() const {