### Feature request

`customButtonsOnHover` fixes a lot of issues with drag and `pointer` styles, but my app currently uses `hidden-inset` so this setting changes the position of the buttons. I'd suggest `customButtonsOnHover` either be an option outside of `titleBarStyle` that respects `titleBarStyle`s values ('hiddenInset' or `hidden') or the addition of a `customButtonsOnHoverInset`.

As a separate note, the docs for `customButtonsOnHover` currently specify it's a Boolean type, but it's a string value.
shell/browser/native_window.h
class NativeBrowserView;
#if defined(OS_MAC)
typedef NSView* NativeWindowHandle;
#else
typedef gfx::AcceleratedWidget NativeWindowHandle;
#endif
class NativeWindow : public base::SupportsUserData,
                     public views::WidgetDelegate {
 public:
  ~NativeWindow() override;
  
  
  static NativeWindow* Create(const gin_helper::Dictionary& options,
                              NativeWindow* parent = nullptr);
  void InitFromOptions(const gin_helper::Dictionary& options);
  virtual void SetContentView(views::View* view) = 0;
  virtual void Close() = 0;
  virtual void CloseImmediately() = 0;
  virtual bool IsClosed() const;
  virtual void Focus(bool focus) = 0;
  virtual bool IsFocused() = 0;
  virtual void Show() = 0;
  virtual void ShowInactive() = 0;
  virtual void Hide() = 0;
  virtual bool IsVisible() = 0;
  virtual bool IsEnabled() = 0;
  virtual void SetEnabled(bool enable) = 0;
  virtual void Maximize() = 0;
  virtual void Unmaximize() = 0;
  virtual bool IsMaximized() = 0;