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### Preflight Checklist
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* [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 a feature request that matches the one I want to file, without success.

### Problem Description
<!-- Is your feature request related to a problem? Please add a clear and concise description of what the problem is. -->

BrowserWindow currently offers "moved" event related to moving a window, but it only has "will-resize" and "resize" events. I want to save the current dimensions of a window when its size changes, but "will-resize" and "resize" events get fired at every single pixel change. This results in an unnecessarily large number of saving function calls or a need for debouncing the event.

### Proposed Solution
<!-- Describe the solution you'd like in a clear and concise manner -->

Adding "resized" event to BrowserWindow will solve the problem stated above.

### Alternatives Considered
<!-- A clear and concise description of any alternative solutions or features you've considered. -->

### Additional Information
<!-- Add any other context about the problem here. -->

shell/browser/api/electron_api_base_window.h
base::PostTask(
        FROM_HERE, {content::BrowserThread::UI},
        base::BindOnce(base::IgnoreResult(&BaseWindow::Emit<Args...>),
                       weak_factory_.GetWeakPtr(), eventName));
  }
#if defined(OS_WIN)
  typedef std::map<UINT, MessageCallback> MessageCallbackMap;
  MessageCallbackMap messages_callback_map_;
#endif
  v8::Global<v8::Value> content_view_;
  std::map<int32_t, v8::Global<v8::Value>> browser_views_;
  v8::Global<v8::Value> menu_;
  v8::Global<v8::Value> parent_window_;
  KeyWeakMap<int> child_windows_;
  std::unique_ptr<NativeWindow> window_;
  
  v8::Global<v8::Value> self_ref_;
  base::WeakPtrFactory<BaseWindow> weak_factory_;
};
}  
}  
#endif