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
OffScreenRenderWidgetHostView(bool transparent,
                                bool painting,
                                int frame_rate,
                                const OnPaintCallback& callback,
                                content::RenderWidgetHost* render_widget_host,
                                OffScreenRenderWidgetHostView* parent_host_view,
                                gfx::Size initial_size);
  ~OffScreenRenderWidgetHostView() override;
  content::BrowserAccessibilityManager* CreateBrowserAccessibilityManager(
      content::BrowserAccessibilityDelegate*,
      bool) override;
  
  void InitAsChild(gfx::NativeView) override;
  void SetSize(const gfx::Size&) override;
  void SetBounds(const gfx::Rect&) override;
  gfx::NativeView GetNativeView(void) const override;
  gfx::NativeViewAccessible GetNativeViewAccessible(void) override;
  ui::TextInputClient* GetTextInputClient() override;
  void Focus(void) override;
  bool HasFocus(void) const override;
  uint32_t GetCaptureSequenceNumber() const override;
  bool IsSurfaceAvailableForCopy(void) const override;
  void Show(void) override;
  void Hide(void) override;
  bool IsShowing(void) override;
  void EnsureSurfaceSynchronizedForLayoutTest() override;
  gfx::Rect GetViewBounds(void) const override;
  gfx::Size GetVisibleViewportSize() const override;
  void SetInsets(const gfx::Insets&) override;
  void SetBackgroundColor(SkColor color) override;