GWT: Save URL in browser's bookmark section

I have a bookmark button in a certain widget in my GWT application. When the user clicks the bookmark button, it generates URL. I need to store this URL in browser(firefox/chrome) bookmark section.

I can use the History class to store a history item, but I don't want that. I simply need that the URL i generate gets saved in the browser's bookmark section or atleast prompts user to save my URL in bookmarks.