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
OffScreenRenderWidgetHostView::CreateBrowserAccessibilityManager(
    content::BrowserAccessibilityDelegate*,
    bool) {
  return nullptr;
}
void OffScreenRenderWidgetHostView::OnBeginFrameTimerTick() {
  const base::TimeTicks frame_time = base::TimeTicks::Now();
  const base::TimeDelta vsync_period =
      base::TimeDelta::FromMicroseconds(frame_rate_threshold_us_);
  SendBeginFrame(frame_time, vsync_period);
}
void OffScreenRenderWidgetHostView::SendBeginFrame(