views: Support accelerators in MenuButton label (issue #2102)

libcef/browser/views/menu_button_view.h

@@ -36,10 +36,15 @@ class CefMenuButtonView :
   // |cef_delegate| must not be nullptr.
   explicit CefMenuButtonView(CefMenuButtonDelegate* cef_delegate);
 
+  void Initialize() override;
+
   // Returns the CefMenuButton associated with this view. See comments on
   // CefViewView::GetCefView.
   CefRefPtr<CefMenuButton> GetCefMenuButton() const;
 
+  // Set the flags that control display of accelerator characters.
+  void SetDrawStringsFlags(int flags);
+
   // views::MenuButtonListener methods:
   void OnMenuButtonClicked(views::MenuButton* source,
                            const gfx::Point& point,