### 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 DidAcquireFullscreen(content::RenderFrameHost* rfh) override;
  
  void DevToolsReloadPage() override;
  
  void DevToolsFocused() override;
  void DevToolsOpened() override;
  void DevToolsClosed() override;
 private:
  ElectronBrowserContext* GetBrowserContext() const;
  
  
  void BindElectronBrowser(
      mojo::PendingReceiver<mojom::ElectronBrowser> receiver,
      content::RenderFrameHost* render_frame_host);
  void OnElectronBrowserConnectionError();
  uint32_t GetNextRequestId() { return ++request_id_; }
#if BUILDFLAG(ENABLE_OSR)
  OffScreenWebContentsView* GetOffScreenWebContentsView() const override;
  OffScreenRenderWidgetHostView* GetOffScreenRenderWidgetHostView() const;
#endif
  
  void Message(bool internal,
               const std::string& channel,
               blink::CloneableMessage arguments) override;
  void Invoke(bool internal,
              const std::string& channel,
              blink::CloneableMessage arguments,
              InvokeCallback callback) override;
  void ReceivePostMessage(const std::string& channel,
                          blink::TransferableMessage message) override;