### 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 for an issue that matches the one I want to file, without success.

### Issue Details

* **Electron Version:**
  * 10.1.1
* **Operating System:**
  * macOS 10.15.4

We recently started launching as hidden on macOS (that is, `show: false` or `browserWindow.hide()` while loading the page, followed by `browserWindow.show()` when the dock icon is clicked). This results in some busted focus behavior on the first activation of the window. The second activation restores it.

### Expected Behavior
The guest page receives a `focus` event on the first activation of the app, when created with `show: false`.

### Actual Behavior
The guest page doesn't receive the first `focus` event. Subsequent activations do trigger a `focus` event.

### To Reproduce
[Electron Fiddle](https://gist.github.com/CharlieHess/c507468cd40630d04f58c6514100b997)

shell/browser/api/electron_api_web_contents.cc
std::vector<printing::PrinterBasicInfo> printers;
  auto print_backend = printing::PrintBackend::CreateInstance(
      nullptr, g_browser_process->GetApplicationLocale());
  {
     TODO(deepak1556): Deprecate this api in favor of an
     async version and post a non blocing task call.
    base::ThreadRestrictions::ScopedAllowIO allow_io;
    print_backend->EnumeratePrinters(&printers);
  }
  return printers;
}
v8::Local<v8::Promise> WebContents::PrintToPDF(base::DictionaryValue settings) {
  v8::Isolate* isolate = JavascriptEnvironment::GetIsolate();
  gin_helper::Promise<v8::Local<v8::Value>> promise(isolate);
  v8::Local<v8::Promise> handle = promise.GetHandle();
  PrintPreviewMessageHandler::FromWebContents(ontents())
      ->PrintToPDF(std::move(settings), std::move(promise));
  return handle;
}
#endif
void WebContents::AddWorkSpace(gin::Arguments* args,
                               const base::FilePath& path) {
  if (path.empty()) {
    gin_helper::ErrorThrower(args->isolate())
        .ThrowError("path cannot be empty");
    return;
  }
  DevToolsAddFileSystem(std::string(), path);
}
void WebContents::RemoveWorkSpace(gin::Arguments* args,