Chrome for Android Has No Extensions, Why?

One of the best things on Chrome for desktop is extensions, web apps, and packaged apps.

Chrome has one of the biggest ecosystems for those. Yet Chrome for Android has none of those. It's not like it's impossible on mobile. Dolphin and Next browser support web apps and extensions.

Google said Chrome was now sharing code on mobile and desktop so why aren't some of the most important features on Android?

Is there a technical reason or a political reason?