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
std::unique_ptr<content::DelegatedFrameHost> delegated_frame_host_;
  std::unique_ptr<content::CursorManager> cursor_manager_;
  std::unique_ptr<AtomCopyFrameGenerator> copy_frame_generator_;
  std::unique_ptr<AtomBeginFrameTimer> begin_frame_timer_;
  
  viz::StubBeginFrameSource begin_frame_source_;
  uint64_t begin_frame_number_ = viz::BeginFrameArgs::kStartingFrameNumber;
#if defined(OS_MACOSX)
  std::unique_ptr<content::BrowserCompositorMac> browser_compositor_;
  SkColor last_frame_root_background_color_;
  
  
  MacHelper* mac_helper_;
  
  std::string selected_text_;
#endif
  content::MouseWheelPhaseHandler mouse_wheel_phase_handler_;
  viz::mojom::CompositorFrameSinkClient* renderer_compositor_frame_sink_ =
      nullptr;
  
  
  
  uint32_t latest_capture_sequence_number_ = 0u;
  SkColor background_color_ = SkColor();
  base::WeakPtrFactory<OffScreenRenderWidgetHostView> weak_ptr_factory_;
  DISALLOW_COPY_AND_ASSIGN(OffScreenRenderWidgetHostView);
};
}  
#endif