This is a copy of the Widevine CL:
https://widevine-internal-review.googlesource.com/#/c/9708/
This CL refactors some of code in oemcrypto/mock and oemcrypto/test in
preparation for adding usage table code.
Change-Id: I7e58c8ecd6d92b3e177cb915733212fcad645485
Builds libwvmdrmengine.so, which is loaded by the new
MediaDrm APIs to support playback of Widevine/CENC
protected content.
Change-Id: I6f57dd37083dfd96c402cb9dd137c7d74edc8f1c