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Chrome is not just a wrapper. WebKit requires you to implement networking, graphics rendering, font rendering etc. There are huge differences between the different WebKit based browsers

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Sure but you can just defer to the OS for the bulk of those services e.g. CoreGraphics, DirectWrite etc.

Things unique to Chrome that don't come from the OS: V8 Javascript engine, process isolation model, networking including new protocols like SPDY and possibly QUIC [1], auto-update (for browser and all apps and extensions) Chrome sync (for bookmarks, open tabs, apps, extensions). Don't forget that the Chrome team is now a major contributor to WebKit.

[1] https://plus.google.com/u/0/100132233764003563318/posts/b36w...

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