I'm not sure whether even Safari and Mobile Safari comes from the same branch of webkit. Chrome and the Android browser definitely don't ... When I spoke to Apple Engineers about how WebGL is available in iAds ("running html5 in a normal webkit view") they mentioned that "webGL is in mobile webkit, but not in mobile safari". This thing, suggesting there's a "mobile webkit", when PPK has shown that feature-wise, there isn't, made me wonder how the webkit tree really looks...
