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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 SetContentView(gin::Handle<View> view);
  void Close();
  virtual void Focus();
  virtual void Blur();
  bool IsFocused();
  void Show();
  void ShowInactive();
  void Hide();
  bool IsVisible();
  bool IsEnabled();
  void SetEnabled(bool enable);
  void Maximize();
  void Unmaximize();
  bool IsMaximized();
  void Minimize();
  void Restore();
  bool IsMinimized();
  void SetFullScreen(bool fullscreen);
  bool IsFullscreen();
  void SetBounds(const gfx::Rect& bounds, gin_helper::Arguments* args);
  gfx::Rect GetBounds();
  void SetSize(int width, int height, gin_helper::Arguments* args);
  std::vector<int> GetSize();
  void SetContentSize(int width, int height, gin_helper::Arguments* args);
  std::vector<int> GetContentSize();
  void SetContentBounds(const gfx::Rect& bounds, gin_helper::Arguments* args);
  gfx::Rect GetContentBounds();
  bool IsNormal();
  gfx::Rect GetNormalBounds();
  void SetMinimumSize(int width, int height);