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
#if defined(OS_MACOSX)
  if (is_showing_)
    browser_compositor_->SetRenderWidgetHostIsHidden(true);
#else
  
  
  if (is_showing_)
    delegated_frame_host_->WasHidden();
  delegated_frame_host_->DetachFromCompositor();
#endif
  if (copy_frame_generator_.get())
    copy_frame_generator_.reset(NULL);
#if defined(OS_MACOSX)
  DestroyPlatformWidget();
#else
  delegated_frame_host_.reset(NULL);
  compositor_.reset(NULL);
  root_layer_.reset(NULL);
#endif
}
content::BrowserAccessibilityManager*