It's not a real "chrome" browser because it's still the same IOS engine which is use so no surprise and it perform the same html5 score that other browser on IOS but there is something funny ...
With IOS dolphin or IOS safari html5test display this text : "Your are using a Apple IPhone on IOS 5.1.1"
With IOS chrome html5test display this text : "Your are using an unknown browser that imitates Safari on a Apple Iphone running 5.1.1"
First look, it's not a very innovative browser but it's perhaps too soon to speak ... i need more time for test it !
If you have a Android device, don't forget to test the new dolphin engine beta apk which have a impressive html5test score (look at @Joannesalfa post on this subject)