### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/main/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/main/CODE_OF_CONDUCT.md) that this project adheres to.
- [X] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a bug report that matches the one I want to file, without success.

### Electron Version

18.0.3

### What operating system are you using?

Windows

### Operating System Version

Windows 10

### What arch are you using?

x64

### Last Known Working Electron version

18.0.0

### Expected Behavior

After entering and exiting fullscreen from an iframe and then focusing the parent page, <kbd>Escape</kbd> key events should be delivered to the parent page.

### Actual Behavior

<kbd>Escape</kbd> key events seem not to be delivered to the page after exiting fullscreen.

https://user-images.githubusercontent.com/172800/162848678-c067d18a-e323-49ea-a6b3-f1526149cad1.mp4




### Testcase Gist URL

https://gist.github.com/bc382eeeb368b70fbed1e177bcaacfde

### Additional Information

This only reproduces on Windows, not on macOS.

Also, this only reproduces when _clicking_ the "exit fullscreen" button in the YouTube embed. Pressing <kbd>Esc</kbd> to exit fullscreen allows the parent page to receive subsequent key events.

18.0.0 - not reproducible
18.0.1 - reproducible
18.0.2 - reproducible
18.0.3 - reproducible

This seems likely to be related to https://github.com/electron/electron/pull/32369. cc @codebytere 
shell/browser/api/electron_api_web_contents.cc
rwh_impl->disable_hidden_ = !background_throttling_;
  ontents()->GetRenderViewHost()->SetSchedulerThrottling(allowed);
  if (rwh_impl->is_hidden()) {
    rwh_impl->WasShown({});
  }
}
int WebContents::GetProcessID() const {
  return ontents()->GetMainFrame()->GetProcess()->GetID();
}
base::ProcessId WebContents::GetOSProcessID() const {
  base::ProcessHandle process_handle =
      ontents()->GetMainFrame()->GetProcess()->GetProcess().Handle();
  return base::GetProcId(process_handle);
}
WebContents::Type WebContents::GetType() const {
  return type_;
}
bool WebContents::Equal(const WebContents* ontents) const {
  return ID() == ontents->ID();
}
GURL WebContents::GetURL() const {
  return ontents()->GetLastCommittedURL();
}
void WebContents::LoadURL(const GURL& url,
                          const gin_helper::Dictionary& options) {
  if (!url.is_valid() || url.spec().size() > url::kMaxURLChars) {
    Emit("did-fail-load", static_cast<int>(net::ERR_INVALID_URL),
         net::ErrorToShortString(net::ERR_INVALID_URL),
         url.possibly_invalid_spec(), true);
    return;