### 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
static gin::Handle<WebContents> Create(v8::Isolate* isolate,
                                         const gin_helper::Dictionary& options);
  static gin::Handle<WebContents> New(v8::Isolate* isolate,
                                      const gin_helper::Dictionary& options);
  
  
  
  static gin::Handle<WebContents> CreateAndTake(
      v8::Isolate* isolate,
      std::unique_ptr<content::WebContents> web_contents,
      Type type);
  
  
  static WebContents* From(content::WebContents* web_contents);
  static WebContents* FromID(int32_t id);
  
  
  
  
  static gin::Handle<WebContents> FromOrCreate(
      v8::Isolate* isolate,
      content::WebContents* web_contents);
  
  static gin::WrapperInfo kWrapperInfo;
  static v8::Local<v8::ObjectTemplate> FillObjectTemplate(
      v8::Isolate*,
      v8::Local<v8::ObjectTemplate>);
  const char* GetTypeName() override;
  base::WeakPtr<WebContents> GetWeakPtr() { return weak_factory_.GetWeakPtr(); }