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

### Alternatives Considered
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### Additional Information
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shell/browser/api/electron_api_base_window.h
bool IsExcludedFromShownWindowsMenu();
  void SetSimpleFullScreen(bool simple_fullscreen);
  bool IsSimpleFullScreen();
  void SetKiosk(bool kiosk);
  bool IsKiosk();
  bool IsTabletMode() const;
  virtual void SetBackgroundColor(const std::string& color_name);
  std::string GetBackgroundColor();
  void SetHasShadow(bool has_shadow);
  bool HasShadow();
  void SetOpacity(const double opacity);
  double GetOpacity();
  void SetShape(const std::vector<gfx::Rect>& rects);
  void SetRepresentedFilename(const std::string& filename);
  std::string GetRepresentedFilename();
  void SetDocumentEdited(bool edited);
  bool IsDocumentEdited();
  void SetIgnoreMouseEvents(bool ignore, gin_helper::Arguments* args);
  void SetContentProtection(bool enable);
  void SetFocusable(bool focusable);
  void SetMenu(v8::Isolate* isolate, v8::Local<v8::Value> menu);
  void RemoveMenu();
  void SetParentWindow(v8::Local<v8::Value> value, gin_helper::Arguments* args);
  virtual void SetBrowserView(v8::Local<v8::Value> value);
  virtual void AddBrowserView(v8::Local<v8::Value> value);
  virtual void RemoveBrowserView(v8::Local<v8::Value> value);
  virtual std::vector<v8::Local<v8::Value>> GetBrowserViews() const;
  virtual void ResetBrowserViews();
  std::string GetMediaSourceId() const;
  v8::Local<v8::Value> GetNativeWindowHandle();