should be reenabled. cc @felixrieseberg
atom/browser/api/atom_api_web_contents.cc
bool only_dirty = false;
  FrameSubscriber::FrameCaptureCallback callback;
  args->GetNext(&only_dirty);
  if (!args->GetNext(&callback)) {
    args->ThrowError();
    return;
  }
  frame_subscriber_.reset(
      new FrameSubscriber(isolate(), web_contents(), callback, only_dirty));
}
void WebContents::EndFrameSubscription() {
  frame_subscriber_.reset();
}
void WebContents::StartDrag(const mate::Dictionary& item,
                            mate::Arguments* args) {
  base::FilePath file;