### 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
void SetZoomFactor(gin_helper::ErrorThrower thrower, double factor);
  double GetZoomFactor() const;
  
  void OnEnterFullscreenModeForTab(
      content::RenderFrameHost* requesting_frame,
      const blink::mojom::FullscreenOptions& options,
      bool allowed);
  
  void OnCreateWindow(const GURL& target_url,
                      const content::Referrer& referrer,
                      const std::string& frame_name,
                      WindowOpenDisposition disposition,
                      const std::string& features,
                      const scoped_refptr<network::ResourceRequestBody>& body);
  
  std::vector<base::FilePath::StringType> GetPreloadPaths() const;
  
  v8::Local<v8::Value> GetWebPreferences(v8::Isolate* isolate) const;
  v8::Local<v8::Value> GetLastWebPreferences(v8::Isolate* isolate) const;
  
  v8::Local<v8::Value> GetOwnerBrowserWindow(v8::Isolate* isolate) const;
  
  
  void GrantOriginAccess(const GURL& url);
  
  void NotifyUserActivation();
  v8::Local<v8::Promise> TakeHeapSnapshot(v8::Isolate* isolate,
                                          const base::FilePath& file_path);
  
  int32_t ID() const { return id_; }