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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/native_window.cc
return sheet_offset_y_;
}
bool NativeWindow::IsTabletMode() const {
  return false;
}
void NativeWindow::SetRepresentedFilename(const std::string& filename) {}
std::string NativeWindow::GetRepresentedFilename() {
  return "";
}
void NativeWindow::SetDocumentEdited(bool edited) {}
bool NativeWindow::IsDocumentEdited() {
  return false;
}
void NativeWindow::SetFocusable(bool focusable) {}
void NativeWindow::SetMenu(ElectronMenuModel* menu) {}
void NativeWindow::SetParentWindow(NativeWindow* parent) {
  parent_ = parent;
}
void NativeWindow::SetAutoHideCursor(bool auto_hide) {}
void NativeWindow::SelectPreviousTab() {}
void NativeWindow::SelectNextTab() {}
void NativeWindow::MergeAllWindows() {}
void NativeWindow::MoveTabToNewWindow() {}
void NativeWindow::ToggleTabBar() {}
bool NativeWindow::AddTabbedWindow(NativeWindow* window) {
  return true;  
}
void NativeWindow::SetVibrancy(const std::string& type) {}