### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
- [X] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a feature request that matches the one I want to file, without success.

### Problem Description

We need to load a custom error page when the certificate is invalid but without "isMainFrame" property we don't know when to load the custom error page using webContents.loadURL()

### Proposed Solution

webContents.on("certificate-error", ((event, url, error, certificate, callback, isMainFrame)

### Alternatives Considered

Not sure

### Additional Information

Not sure
shell/browser/api/electron_api_app.cc
#if defined(OS_LINUX)
  
  
  media::AudioManager::SetGlobalAppName(Browser::Get()->GetName());
#endif
  Emit("ready", launch_info);
}
void App::OnPreMainMessageLoopRun() {
  content::BrowserChildProcessObserver::Add(this);
  if (process_singleton_) {
    process_singleton_->OnBrowserReady();
  }
}
void App::OnPreCreateThreads() {
  DCHECK(!content::GpuDataManager::Initialized());
  content::GpuDataManager* manager = content::GpuDataManager::GetInstance();
  manager->AddObserver(this);
  if (disable_hw_acceleration_) {
    manager->DisableHardwareAcceleration();
  }
  if (disable_domain_blocking_for_3DAPIs_) {
    content::GpuDataManagerImpl::GetInstance()
        ->DisableDomainBlockingFor3DAPIsForTesting();
  }
}
void App::OnAccessibilitySupportChanged() {
  Emit("accessibility-support-changed", IsAccessibilitySupportEnabled());
}
#if defined(OS_MAC)
void App::OnWillContinueUserActivity(bool* prevent_default,