Lollipop trust agent sample. See post below for details:
http://nelenkov.blogspot.com/2014/12/dissecting-lollipops-smart-lock.html
Copy to packages/apps/ in AOSP tree. Drop Spongy Castle lightweight API
jar in libs/ and adjust Android.mk accordingly (tested with
sc-light-jdk15on-1.47.0.2.jar).
Run mm to build.