with Ludei's Atomic Plugins https://github.com/ludei/atomic-plugins-c2
you can use native AdMob ads in Cocoon.io
I have tested them and they are working well; and now, as in Cordova, you will get 2 APKs: one for ARM processors and one for Intel processors; my 5-6 MB zip files are changed into 12 MB APKs, so it's much better than in Crosswalk; and it's still fast
however it's still beta, so people are finding bugs, and Ludei is fixing them
anyway: I have just tested one of my super simple apps using Chromium, technology advised by Scirra: 1 object with 1 sine behavior (moving left and right) and even this was not smooth on Android. LOL.
It seems that Ludei treats us more serious. And they do it for free.