### 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.h
bool IsAudioMuted();
  bool IsCurrentlyAudible();
  void SetEmbedder(const WebContents* embedder);
  void SetDevToolsWebContents(const WebContents* devtools);
  v8::Local<v8::Value> GetNativeView(v8::Isolate* isolate) const;
  void IncrementCapturerCount(gin::Arguments* args);
  void DecrementCapturerCount(gin::Arguments* args);
  bool IsBeingCaptured();
#if BUILDFLAG(ENABLE_PRINTING)
  void OnGetDefaultPrinter(base::Value print_settings,
                           printing::CompletionCallback print_callback,
                           base::string16 device_name,
                           bool silent,
                           base::string16 default_printer);
  void Print(gin::Arguments* args);
  std::vector<printing::PrinterBasicInfo> GetPrinterList();
  
  v8::Local<v8::Promise> PrintToPDF(base::DictionaryValue settings);
#endif
  
  void AddWorkSpace(gin::Arguments* args, const base::FilePath& path);
  void RemoveWorkSpace(gin::Arguments* args, const base::FilePath& path);
  
  void Undo();
  void Redo();
  void Cut();
  void Copy();
  void Paste();
  void PasteAndMatchStyle();
  void Delete();