void WebContents::OnFirstNonEmptyLayout() {
  if (receivers_.current_context() == web_contents()->GetMainFrame()) {
    Emit("ready-to-show");
  }
}
void WebContents::OnFirstNonEmptyLayout() {
  if (receivers_.current_context() == web_contents()->GetMainFrame()) {
    Emit("ready-to-show");
  }
}