Desktop window manager integration seems to always be tricky. I've personally sunk months of my life in getting a variety of custom window frames to work "well

Desktop window manager integration seems to always be tricky. I've personally sunk months of my life in getting a variety of custom window frames to work "well enough" on various Windows flavors (for Chrome on XP, Vista, 7 and newer). I think part of the benefit of these new mobile platforms is their simplicity - there is less going on outside the app's control at any given point in time, so there's less to worry about. (On Windows, there are several ways to achieve a "custom-ish" frame, but only if you really study the window manager-app interaction and think about the problem as if you were the window manager can you come close to doing a proper job of it... handling the right messages (some of which are undocumented and only discovered via using spy tools), responding in the correct way etc.)