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

/cc @brenca @codebytere 
atom/browser/osr/osr_web_contents_view.cc
#include "atom/browser/osr/osr_web_contents_view.h"
#include "atom/common/api/api_messages.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/render_view_host.h"
#include "third_party/blink/public/platform/web_screen_info.h"
#include "ui/display/screen.h"
namespace atom {
OffScreenWebContentsView::OffScreenWebContentsView(
    bool transparent,
    const OnPaintCallback& callback)
    : native_window_(nullptr), transparent_(transparent), callback_(callback) {
#if defined(OS_MACOSX)
  PlatformCreate();
#endif
}
OffScreenWebContentsView::~OffScreenWebContentsView() {
  if (native_window_)
    native_window_->RemoveObserver(this);
#if defined(OS_MACOSX)
  PlatformDestroy();
#endif
}
void OffScreenWebContentsView::SetWebContents(
    content::WebContents* web_contents) {
  web_contents_ = web_contents;
  RenderViewCreated(web_contents_->GetRenderViewHost());
}
void OffScreenWebContentsView::SetNativeWindow(NativeWindow* window) {