I am playing around and see that the idea of additional field, like I described above isn’t really good in terms of UX. So I came up with another idea to restore enough space for the url in toolbar and free it from icons a little bit - what if we use FAB with menu to move share outside toolbar? Here is an example
http://i.imgur.com/Jr4mEOO.png▾
So we are moving into this FAB save action and both items, which are hidden under share icon.
Of course FAB will hide during scroll down.