I’ve been saying for some time that Google’s longer-term plans for application development all hinged around Chrome. Native Android apps are silos: although Google has built tools which allow developers to make Android apps searchable (and thus a target for ad sales, and tracking) it’s much harder than with a native HTML web app.
Building an app using native tools is also a dead-end: developers have to work harder to create a web-native equivalent. And web-native equivalents can be easily supported by advertising, supplied by… you guessed it… Google.
Chrome Packaged Apps, on the other hand, are “native” web apps – and the web is Google’s true focus. So it’s no surprise that Google has released an early release which lets you bring Packaged Apps to iOS and Android.
Chome is the development platform, not Android: Android is just the host, just like iOS is.