being introduced experimentally in the 4.4 release.
source : http://source.android.com/devices/tech/dalvik/art.html
in detail : http://publib.boulder.ibm.com/infocenter/realtime/v1r0/index.jsp?topic=/com.ibm.rt.doc.10/realtime/aot.html http://sourcex.wordpress.com/2013/11/12/art-runtime-for-kitkat-4-4-explained/ http://lifehacker.com/android-art-vs-dalvik-runtimes-effect-on-battery-life-1507264545 http://liliputing.com/2014/01/goodbye-dalvik-android-code-commit-makes-art-runtime-default.html
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