What devices are you talking about? Aside from emulation, Android apps can't run natively in Chrome.
I think what you're actually referring to is that the Linux kernel is adaptive across multiple form factors. But even that would be splitting hairs as NT has been on phones for years.
I'm sorry if I'm misunderstanding you, but it really sounds like you're saying that you can write an Android app once and have it adapt to a phone/tablet/PC UI while simultaneously being native. Android can't do that, only Windows can. When you write a universal app, it can adapt to tablets, laptops, and desktops. All ARC does is emulate Android apps. If I'm misunderstanding you, please let me know.