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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
<!-- A clear and concise description of any alternative solutions or features you've considered. -->

### Additional Information
<!-- Add any other context about the problem here. -->

shell/browser/api/electron_api_base_window.cc
if (Emit("system-context-menu", gfx::Point(x, y))) {
    *prevent_default = true;
  }
}
#if defined(OS_WIN)
void BaseWindow::OnWindowMessage(UINT message, WPARAM w_param, LPARAM l_param) {
  if (IsWindowMessageHooked(message)) {
    v8::Isolate* isolate = JavascriptEnvironment::GetIsolate();
    v8::Locker locker(isolate);
    v8::HandleScope scope(isolate);
    messages_callback_map_[message].Run(
        ToBuffer(isolate, static_cast<void*>(&w_param), sizeof(WPARAM)),
        ToBuffer(isolate, static_cast<void*>(&l_param), sizeof(LPARAM)));
  }
}
#endif
void BaseWindow::SetContentView(gin::Handle<View> view) {
  ResetBrowserViews();
  content_view_.Reset(isolate(), view.ToV8());
  window_->SetContentView(view->view());
}
void BaseWindow::Close() {
  window_->Close();
}
void BaseWindow::Focus() {
  window_->Focus(true);
}
void BaseWindow::Blur() {