### 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.cc
CommonWebContentsDelegate::ExitFullscreenModeForTab(source);
  Emit("leave-html-full-screen");
}
void WebContents::RendererUnresponsive(
    content::WebContents* source,
    content::RenderWidgetHost* render_widget_host,
    base::RepeatingClosure hang_monitor_restarter) {
  Emit("unresponsive");
}
void WebContents::RendererResponsive(
    content::WebContents* source,
    content::RenderWidgetHost* render_widget_host) {
  Emit("responsive");
}
bool WebContents::HandleContextMenu(content::RenderFrameHost* render_frame_host,
                                    const content::ContextMenuParams& params) {
  if (params.custom_context.is_pepper_menu) {
    Emit("pepper-context-menu", std::make_pair(params, ontents()),
         base::BindOnce(&content::WebContents::NotifyContextMenuClosed,
                        base::Unretained(ontents()),
                        params.custom_context));
  } else {
    Emit("context-menu", std::make_pair(params, ontents()));
  }
  return true;
}
bool WebContents::OnGoToEntryOffset(int offset) {