### 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
#include "content/public/browser/render_widget_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_observer.h"
#include "electron/buildflags/buildflags.h"
#include "electron/shell/common/api/api.mojom.h"
#include "gin/handle.h"
#include "gin/wrappable.h"
#include "mojo/public/cpp/bindings/receiver_set.h"
#include "printing/buildflags/buildflags.h"
#include "services/service_manager/public/cpp/binder_registry.h"
#include "shell/browser/api/frame_subscriber.h"
#include "shell/browser/api/save_page_handler.h"
#include "shell/browser/common_web_contents_delegate.h"
#include "shell/browser/event_emitter_mixin.h"
#include "shell/common/gin_helper/cleaned_up_at_exit.h"
#include "shell/common/gin_helper/constructible.h"
#include "shell/common/gin_helper/error_thrower.h"
#include "ui/gfx/image/image.h"
#if BUILDFLAG(ENABLE_PRINTING)
#include "chrome/browser/printing/print_view_manager_basic.h"
#include "components/printing/common/print_messages.h"
#include "printing/backend/print_backend.h"  
#include "shell/browser/printing/print_preview_message_handler.h"
#if defined(OS_WIN)
#include "printing/backend/win_helper.h"
#endif
#endif
#if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
namespace extensions {
class ScriptExecutor;