I added a Mock OEMCrypto implementation with stubs only. I corrected the "extern C" location in OEMCrypto.h. (Thanks, Jerry!) I added some Android.mk files that allows us to compile and run a few simple unit tests. Unit Test 1: The library compiles. (passes) Unit Test 2: The test program links and runs. (passes) Change-Id: Ib4c9554553de49645b5841b0bae889728cbfc8b1