Bringing this discussion over to the Google thread:
Originally Posted By: DWallach
Amusement: Google has a much easier time of this, with running Android apps on ChromeOS devices (no, really), since Android apps are distributed as Dalvik bytecode which is then compiled at install time for the local machine architecture. Thus, most Android apps don't know or care whether they're on x86 or ARM.

I'm curious, how many apps do you know of using the NDK? Figures out there put this at 50% of the top 250 apps according to ARM, either due to the NDK or other paths to running native code on Android. That seems unusually high to me.

Also looks like Android 5.0 is the end of the road for Dalvik at last. Android Runtime (ART) has now replaced it. The benefit here seems to be moving from a just-in-time approach to ahead-of-time, boosting application performance and lowering battery consumption.