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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/native_window.cc
return widget();
}
base::string16 NativeWindow::GetAccessibleWindowTitle() const {
  if (accessible_title_.empty()) {
    return views::WidgetDelegate::GetAccessibleWindowTitle();
  }
  return accessible_title_;
}
void NativeWindow::SetAccessibleTitle(const std::string& title) {
  accessible_title_ = base::UTF8ToUTF16(title);
}
std::string NativeWindow::GetAccessibleTitle() {
  return base::UTF16ToUTF8(accessible_title_);
}
int32_t NativeWindow::next_id_ = 0;
void NativeWindowRelay::CreateForWebContents(
    content::WebContents* web_contents,
    base::WeakPtr<NativeWindow> window) {
  DCHECK(web_contents);
  if (!web_contents->GetUserData(UserDataKey())) {
    web_contents->SetUserData(UserDataKey(),
                              base::WrapUnique(new NativeWindowRelay(window)));
  }
}
NativeWindowRelay::NativeWindowRelay(base::WeakPtr<NativeWindow> window)
    : native_window_(window) {}
NativeWindowRelay::~NativeWindowRelay() = default;
WEB_CONTENTS_USER_DATA_KEY_IMPL(NativeWindowRelay)
}