### 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
WebContents* embedder_ = nullptr;
  
  WebContentsZoomController* zoom_controller_ = nullptr;
  
  Type type_ = Type::BROWSER_WINDOW;
  int32_t id_;
  
  uint32_t request_id_ = 0;
  
  bool background_throttling_ = true;
  
  bool enable_devtools_ = true;
  
  base::ObserverList<ExtendedWebContentsObserver> observers_;
  
  
  int currently_committed_process_id_ = -1;
  service_manager::BinderRegistryWithArgs<content::RenderFrameHost*> registry_;
  mojo::ReceiverSet<mojom::ElectronBrowser, content::RenderFrameHost*>
      receivers_;
  std::map<content::RenderFrameHost*, std::vector<mojo::ReceiverId>>
      frame_to_receivers_map_;
  base::WeakPtrFactory<WebContents> weak_factory_;
  DISALLOW_COPY_AND_ASSIGN(WebContents);
};
}  
}  
#endif