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

shell/browser/api/electron_api_base_window.h
void OnWindowUnmaximize() override;
  void OnWindowMinimize() override;
  void OnWindowRestore() override;
  void OnWindowWillResize(const gfx::Rect& new_bounds,
                          bool* prevent_default) override;
  void OnWindowResize() override;
  void OnWindowWillMove(const gfx::Rect& new_bounds,
                        bool* prevent_default) override;
  void OnWindowMove() override;
  void OnWindowMoved() override;
  void OnWindowScrollTouchBegin() override;
  void OnWindowScrollTouchEnd() override;
  void OnWindowSwipe(const std::string& direction) override;
  void OnWindowRotateGesture(float rotation) override;
  void OnWindowSheetBegin() override;
  void OnWindowSheetEnd() override;
  void OnWindowEnterFullScreen() override;
  void OnWindowLeaveFullScreen() override;
  void OnWindowEnterHtmlFullScreen() override;
  void OnWindowLeaveHtmlFullScreen() override;
  void OnWindowAlwaysOnTopChanged() override;
  void OnExecuteAppCommand(const std::string& command_name) override;
  void OnTouchBarItemResult(const std::string& item_id,
                            const base::DictionaryValue& details) override;
  void OnNewWindowForTab() override;
  void OnSystemContextMenu(int x, int y, bool* prevent_default) override;
#if defined(OS_WIN)
  void OnWindowMessage(UINT message, WPARAM w_param, LPARAM l_param) override;
#endif