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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.cc
int height,
                                gin_helper::Arguments* args) {
  bool animate = false;
  args->GetNext(&animate);
  window_->SetContentSize(gfx::Size(width, height), animate);
}
std::vector<int> BaseWindow::GetContentSize() {
  std::vector<int> result(2);
  gfx::Size size = window_->GetContentSize();
  result[0] = size.width();
  result[1] = size.height();
  return result;
}
void BaseWindow::SetMinimumSize(int width, int height) {
  window_->SetMinimumSize(gfx::Size(width, height));
}
std::vector<int> BaseWindow::GetMinimumSize() {
  std::vector<int> result(2);
  gfx::Size size = window_->GetMinimumSize();
  result[0] = size.width();
  result[1] = size.height();
  return result;
}
void BaseWindow::SetMaximumSize(int width, int height) {