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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
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shell/browser/api/electron_api_base_window.h
void SetProgressBar(double progress, gin_helper::Arguments* args);
  void SetOverlayIcon(const gfx::Image& overlay,
                      const std::string& description);
  void SetVisibleOnAllWorkspaces(bool visible, gin_helper::Arguments* args);
  bool IsVisibleOnAllWorkspaces();
  void SetAutoHideCursor(bool auto_hide);
  virtual void SetVibrancy(v8::Isolate* isolate, v8::Local<v8::Value> value);
#if defined(OS_MAC)
  void SetTrafficLightPosition(const gfx::Point& position);
  gfx::Point GetTrafficLightPosition() const;
#endif
  void SetTouchBar(std::vector<gin_helper::PersistentDictionary> items);
  void RefreshTouchBarItem(const std::string& item_id);
  void SetEscapeTouchBarItem(gin_helper::PersistentDictionary item);
  void SelectPreviousTab();
  void SelectNextTab();
  void MergeAllWindows();
  void MoveTabToNewWindow();
  void ToggleTabBar();
  void AddTabbedWindow(NativeWindow* window, gin_helper::Arguments* args);
  void SetWindowButtonVisibility(bool visible, gin_helper::Arguments* args);
  void SetAutoHideMenuBar(bool auto_hide);
  bool IsMenuBarAutoHide();
  void SetMenuBarVisibility(bool visible);
  bool IsMenuBarVisible();
  void SetAspectRatio(double aspect_ratio, gin_helper::Arguments* args);
  void PreviewFile(const std::string& path, gin_helper::Arguments* args);
  void CloseFilePreview();
  void SetGTKDarkThemeEnabled(bool use_dark_theme);