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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/native_window_views.h
bool IsMenuBarVisible() override;
  void SetVisibleOnAllWorkspaces(bool visible,
                                 bool visibleOnFullScreen) override;
  bool IsVisibleOnAllWorkspaces() override;
  void SetGTKDarkThemeEnabled(bool use_dark_theme) override;
  content::DesktopMediaID GetDesktopMediaID() const override;
  gfx::AcceleratedWidget GetAcceleratedWidget() const override;
  NativeWindowHandle GetNativeWindowHandle() const override;
  gfx::Rect ContentBoundsToWindowBounds(const gfx::Rect& bounds) const override;
  gfx::Rect WindowBoundsToContentBounds(const gfx::Rect& bounds) const override;
  void UpdateDraggableRegions(
      const std::vector<mojom::DraggableRegionPtr>& regions);
  void IncrementChildModals();
  void DecrementChildModals();
#if defined(OS_WIN)
  
  
  
  
  
  
  bool PreHandleMSG(UINT message,
                    WPARAM w_param,
                    LPARAM l_param,
                    LRESULT* result);
  void SetIcon(HICON small_icon, HICON app_icon);
#elif defined(OS_LINUX)
  void SetIcon(const gfx::ImageSkia& icon);
#endif
  SkRegion* draggable_region() const { return draggable_region_.get(); }